diff --git a/src/main/engine/BlogGenerationEngine.ts b/src/main/engine/BlogGenerationEngine.ts
index 9082e09..92a42a4 100644
--- a/src/main/engine/BlogGenerationEngine.ts
+++ b/src/main/engine/BlogGenerationEngine.ts
@@ -82,6 +82,14 @@ export interface SiteValidationApplyResult {
   removedEmptyDirCount: number;
 }
 
+interface GenerationPostIndex {
+  postsByCategory: Map<string, PostData[]>;
+  postsByTag: Map<string, PostData[]>;
+  postsByYear: Map<number, PostData[]>;
+  postsByYearMonth: Map<string, PostData[]>;
+  postsByYearMonthDay: Map<string, PostData[]>;
+}
+
 export function resolvePublicBaseUrl(publicUrl?: string): string | null {
   const trimmed = (publicUrl || '').trim();
   if (!trimmed) {
@@ -474,6 +482,7 @@ export class BlogGenerationEngine {
     }
 
     const latestPostUpdatedAt = publishedListPosts[0]?.updatedAt.toISOString() || now;
+    const generationPostIndex = this.buildGenerationPostIndex(publishedListPosts);
 
     onProgress(5, 'Building sitemap XML...');
 
@@ -490,46 +499,33 @@ export class BlogGenerationEngine {
     for (const [year, lastmod] of Array.from(years.entries()).sort((a, b) => b[0] - a[0])) {
       urls.push(buildSitemapUrl(`${options.baseUrl}/${year}`, lastmod.toISOString(), 'monthly', '0.5'));
 
-      const yearCount = publishedListPosts.filter((post) => resolvePostCreatedAt(post).getFullYear() === year).length;
+      const yearCount = generationPostIndex.postsByYear.get(year)?.length ?? 0;
       appendPaginatedSitemapUrls(urls, options.baseUrl, `/${year}`, yearCount, maxPostsPerPage, lastmod.toISOString(), 'monthly', '0.4');
     }
     for (const [ym, lastmod] of Array.from(yearMonths.entries()).sort().reverse()) {
       urls.push(buildSitemapUrl(`${options.baseUrl}/${ym}`, lastmod.toISOString(), 'monthly', '0.5'));
 
-      const [yearStr, monthStr] = ym.split('/');
-      const year = Number(yearStr);
-      const month = Number(monthStr);
-      const monthCount = publishedListPosts.filter((post) => {
-        const d = resolvePostCreatedAt(post);
-        return d.getFullYear() === year && (d.getMonth() + 1) === month;
-      }).length;
+      const monthCount = generationPostIndex.postsByYearMonth.get(ym)?.length ?? 0;
       appendPaginatedSitemapUrls(urls, options.baseUrl, `/${ym}`, monthCount, maxPostsPerPage, lastmod.toISOString(), 'monthly', '0.4');
     }
     for (const [ymd, lastmod] of Array.from(yearMonthDays.entries()).sort().reverse()) {
       urls.push(buildSitemapUrl(`${options.baseUrl}/${ymd}`, lastmod.toISOString(), 'monthly', '0.4'));
 
-      const [yearStr, monthStr, dayStr] = ymd.split('/');
-      const year = Number(yearStr);
-      const month = Number(monthStr);
-      const day = Number(dayStr);
-      const dayCount = publishedListPosts.filter((post) => {
-        const d = resolvePostCreatedAt(post);
-        return d.getFullYear() === year && (d.getMonth() + 1) === month && d.getDate() === day;
-      }).length;
+      const dayCount = generationPostIndex.postsByYearMonthDay.get(ymd)?.length ?? 0;
       appendPaginatedSitemapUrls(urls, options.baseUrl, `/${ymd}`, dayCount, maxPostsPerPage, lastmod.toISOString(), 'monthly', '0.3');
     }
 
     for (const category of Array.from(allCategories).sort()) {
       urls.push(buildSitemapUrl(`${options.baseUrl}/category/${encodeURIComponent(category)}`, latestPostUpdatedAt, 'weekly', '0.6'));
 
-      const categoryCount = publishedListPosts.filter((post) => (post.categories || []).includes(category)).length;
+      const categoryCount = generationPostIndex.postsByCategory.get(category)?.length ?? 0;
       appendPaginatedSitemapUrls(urls, options.baseUrl, `/category/${encodeURIComponent(category)}`, categoryCount, maxPostsPerPage, latestPostUpdatedAt, 'weekly', '0.5');
     }
 
     for (const tag of Array.from(allTags).sort()) {
       urls.push(buildSitemapUrl(`${options.baseUrl}/tag/${encodeURIComponent(tag)}`, latestPostUpdatedAt, 'weekly', '0.6'));
 
-      const tagCount = publishedListPosts.filter((post) => (post.tags || []).includes(tag)).length;
+      const tagCount = generationPostIndex.postsByTag.get(tag)?.length ?? 0;
       appendPaginatedSitemapUrls(urls, options.baseUrl, `/tag/${encodeURIComponent(tag)}`, tagCount, maxPostsPerPage, latestPostUpdatedAt, 'weekly', '0.5');
     }
 
@@ -642,6 +638,7 @@ export class BlogGenerationEngine {
       yearMonths,
       yearMonthDays,
       maxPostsPerPage,
+      generationPostIndex,
     );
     const totalEstimatedUnits = [
       includeCore ? estimatedUnitsBySection.core : 0,
@@ -696,17 +693,30 @@ export class BlogGenerationEngine {
 
     if (includeCategory) {
       onProgress(50, 'Generating category pages...');
-      pagesGenerated += await this.generateCategoryPages(options.projectId, publishedListPosts, allCategories, maxPostsPerPage, htmlDir, renderRoute, reportUnitProgress);
+      pagesGenerated += await this.generateCategoryPages(options.projectId, publishedListPosts, allCategories, maxPostsPerPage, htmlDir, renderRoute, reportUnitProgress, generationPostIndex.postsByCategory);
     }
 
     if (includeTag) {
       onProgress(65, 'Generating tag pages...');
-      pagesGenerated += await this.generateTagPages(options.projectId, publishedListPosts, allTags, maxPostsPerPage, htmlDir, renderRoute, reportUnitProgress);
+      pagesGenerated += await this.generateTagPages(options.projectId, publishedListPosts, allTags, maxPostsPerPage, htmlDir, renderRoute, reportUnitProgress, generationPostIndex.postsByTag);
     }
 
     if (includeDate) {
       onProgress(80, 'Generating date archive pages...');
-      pagesGenerated += await this.generateDateArchivePages(options.projectId, publishedListPosts, years, yearMonths, yearMonthDays, maxPostsPerPage, htmlDir, renderRoute, reportUnitProgress);
+      pagesGenerated += await this.generateDateArchivePages(
+        options.projectId,
+        publishedListPosts,
+        years,
+        yearMonths,
+        yearMonthDays,
+        maxPostsPerPage,
+        htmlDir,
+        renderRoute,
+        reportUnitProgress,
+        generationPostIndex.postsByYear,
+        generationPostIndex.postsByYearMonth,
+        generationPostIndex.postsByYearMonthDay,
+      );
     }
 
     onProgress(100, `Site generated (${publishedPosts.length} posts, ${pagesGenerated} pages)`);
@@ -798,6 +808,7 @@ export class BlogGenerationEngine {
     }
     const publishedListPosts = Array.from(publishedListPostById.values())
       .sort((a, b) => b.createdAt.getTime() - a.createdAt.getTime());
+    const generationPostIndex = this.buildGenerationPostIndex(publishedListPosts);
 
     const now = new Date().toISOString();
     const allTags = new Set<string>();
@@ -866,46 +877,33 @@ export class BlogGenerationEngine {
     for (const [year, lastmod] of Array.from(years.entries()).sort((a, b) => b[0] - a[0])) {
       urls.push(buildSitemapUrl(`${options.baseUrl}/${year}`, lastmod.toISOString(), 'monthly', '0.5'));
 
-      const yearCount = publishedListPosts.filter((post) => resolvePostCreatedAt(post).getFullYear() === year).length;
+      const yearCount = generationPostIndex.postsByYear.get(year)?.length ?? 0;
       appendPaginatedSitemapUrls(urls, options.baseUrl, `/${year}`, yearCount, maxPostsPerPage, lastmod.toISOString(), 'monthly', '0.4');
     }
     for (const [ym, lastmod] of Array.from(yearMonths.entries()).sort().reverse()) {
       urls.push(buildSitemapUrl(`${options.baseUrl}/${ym}`, lastmod.toISOString(), 'monthly', '0.5'));
 
-      const [yearStr, monthStr] = ym.split('/');
-      const year = Number(yearStr);
-      const month = Number(monthStr);
-      const monthCount = publishedListPosts.filter((post) => {
-        const d = resolvePostCreatedAt(post);
-        return d.getFullYear() === year && (d.getMonth() + 1) === month;
-      }).length;
+      const monthCount = generationPostIndex.postsByYearMonth.get(ym)?.length ?? 0;
       appendPaginatedSitemapUrls(urls, options.baseUrl, `/${ym}`, monthCount, maxPostsPerPage, lastmod.toISOString(), 'monthly', '0.4');
     }
     for (const [ymd, lastmod] of Array.from(yearMonthDays.entries()).sort().reverse()) {
       urls.push(buildSitemapUrl(`${options.baseUrl}/${ymd}`, lastmod.toISOString(), 'monthly', '0.4'));
 
-      const [yearStr, monthStr, dayStr] = ymd.split('/');
-      const year = Number(yearStr);
-      const month = Number(monthStr);
-      const day = Number(dayStr);
-      const dayCount = publishedListPosts.filter((post) => {
-        const d = resolvePostCreatedAt(post);
-        return d.getFullYear() === year && (d.getMonth() + 1) === month && d.getDate() === day;
-      }).length;
+      const dayCount = generationPostIndex.postsByYearMonthDay.get(ymd)?.length ?? 0;
       appendPaginatedSitemapUrls(urls, options.baseUrl, `/${ymd}`, dayCount, maxPostsPerPage, lastmod.toISOString(), 'monthly', '0.3');
     }
 
     for (const category of Array.from(allCategories).sort()) {
       urls.push(buildSitemapUrl(`${options.baseUrl}/category/${encodeURIComponent(category)}`, latestPostUpdatedAt, 'weekly', '0.6'));
 
-      const categoryCount = publishedListPosts.filter((post) => (post.categories || []).includes(category)).length;
+      const categoryCount = generationPostIndex.postsByCategory.get(category)?.length ?? 0;
       appendPaginatedSitemapUrls(urls, options.baseUrl, `/category/${encodeURIComponent(category)}`, categoryCount, maxPostsPerPage, latestPostUpdatedAt, 'weekly', '0.5');
     }
 
     for (const tag of Array.from(allTags).sort()) {
       urls.push(buildSitemapUrl(`${options.baseUrl}/tag/${encodeURIComponent(tag)}`, latestPostUpdatedAt, 'weekly', '0.6'));
 
-      const tagCount = publishedListPosts.filter((post) => (post.tags || []).includes(tag)).length;
+      const tagCount = generationPostIndex.postsByTag.get(tag)?.length ?? 0;
       appendPaginatedSitemapUrls(urls, options.baseUrl, `/tag/${encodeURIComponent(tag)}`, tagCount, maxPostsPerPage, latestPostUpdatedAt, 'weekly', '0.5');
     }
 
@@ -1192,6 +1190,7 @@ export class BlogGenerationEngine {
       }
       const publishedListPosts = Array.from(publishedListPostById.values())
         .sort((a, b) => b.createdAt.getTime() - a.createdAt.getTime());
+      const generationPostIndex = this.buildGenerationPostIndex(publishedListPosts);
 
       const allCategories = new Set<string>();
       const allTags = new Set<string>();
@@ -1367,6 +1366,7 @@ export class BlogGenerationEngine {
           htmlDir,
           renderRoute,
           onPageGenerated,
+          generationPostIndex.postsByCategory,
         );
       }
 
@@ -1379,6 +1379,7 @@ export class BlogGenerationEngine {
           htmlDir,
           renderRoute,
           onPageGenerated,
+          generationPostIndex.postsByTag,
         );
       }
 
@@ -1403,6 +1404,9 @@ export class BlogGenerationEngine {
           htmlDir,
           renderRoute,
           onPageGenerated,
+          generationPostIndex.postsByYear,
+          generationPostIndex.postsByYearMonth,
+          generationPostIndex.postsByYearMonthDay,
         );
       }
     }
@@ -1690,11 +1694,12 @@ export class BlogGenerationEngine {
     htmlDir: string,
     renderRoute: (pathname: string) => Promise<string | null>,
     onPageGenerated: (message: string) => void,
+    postsByCategory?: Map<string, PostData[]>,
   ): Promise<number> {
     let count = 0;
 
     for (const category of Array.from(allCategories).sort()) {
-      const categoryPosts = posts.filter((post) => (post.categories || []).includes(category));
+      const categoryPosts = postsByCategory?.get(category) ?? posts.filter((post) => (post.categories || []).includes(category));
       if (categoryPosts.length === 0) continue;
 
       const totalPages = Math.max(1, Math.ceil(categoryPosts.length / maxPostsPerPage));
@@ -1732,11 +1737,12 @@ export class BlogGenerationEngine {
     htmlDir: string,
     renderRoute: (pathname: string) => Promise<string | null>,
     onPageGenerated: (message: string) => void,
+    postsByTag?: Map<string, PostData[]>,
   ): Promise<number> {
     let count = 0;
 
     for (const tag of Array.from(allTags).sort()) {
-      const tagPosts = posts.filter((post) => (post.tags || []).includes(tag));
+      const tagPosts = postsByTag?.get(tag) ?? posts.filter((post) => (post.tags || []).includes(tag));
       if (tagPosts.length === 0) continue;
 
       const totalPages = Math.max(1, Math.ceil(tagPosts.length / maxPostsPerPage));
@@ -1776,11 +1782,14 @@ export class BlogGenerationEngine {
     htmlDir: string,
     renderRoute: (pathname: string) => Promise<string | null>,
     onPageGenerated: (message: string) => void,
+    postsByYear?: Map<number, PostData[]>,
+    postsByYearMonth?: Map<string, PostData[]>,
+    postsByYearMonthDay?: Map<string, PostData[]>,
   ): Promise<number> {
     let count = 0;
 
     for (const [year] of Array.from(yearsMap.entries()).sort((a, b) => b[0] - a[0])) {
-      const yearPosts = posts.filter((post) => resolvePostCreatedAt(post).getFullYear() === year);
+      const yearPosts = postsByYear?.get(year) ?? posts.filter((post) => resolvePostCreatedAt(post).getFullYear() === year);
       count += await this.generatePaginatedListPages(
         projectId, yearPosts, maxPostsPerPage, htmlDir, renderRoute, onPageGenerated,
         `${year}`,
@@ -1791,7 +1800,7 @@ export class BlogGenerationEngine {
       const [yearStr, monthStr] = ym.split('/');
       const year = Number(yearStr);
       const month = Number(monthStr);
-      const monthPosts = posts.filter((post) => {
+      const monthPosts = postsByYearMonth?.get(ym) ?? posts.filter((post) => {
         const d = resolvePostCreatedAt(post);
         return d.getFullYear() === year && (d.getMonth() + 1) === month;
       });
@@ -1806,7 +1815,7 @@ export class BlogGenerationEngine {
       const year = Number(yearStr);
       const month = Number(monthStr);
       const day = Number(dayStr);
-      const dayPosts = posts.filter((post) => {
+      const dayPosts = postsByYearMonthDay?.get(ymd) ?? posts.filter((post) => {
         const d = resolvePostCreatedAt(post);
         return d.getFullYear() === year && (d.getMonth() + 1) === month && d.getDate() === day;
       });
@@ -1862,48 +1871,37 @@ export class BlogGenerationEngine {
     yearMonthsMap: Map<string, Date>,
     yearMonthDaysMap: Map<string, Date>,
     maxPostsPerPage: number,
+    postIndex?: GenerationPostIndex,
   ): Record<BlogGenerationSection, number> {
+    const index = postIndex ?? this.buildGenerationPostIndex(posts);
     const rootPages = this.countPaginatedPages(posts.length, maxPostsPerPage);
-    const pageRoutes = posts.filter((post) => (post.categories || []).includes('page')).length;
+    const pageRoutes = index.postsByCategory.get('page')?.length ?? 0;
 
     const categoryPages = Array.from(allCategories).reduce((sum, category) => {
-      const count = posts.filter((post) => (post.categories || []).includes(category)).length;
+      const count = index.postsByCategory.get(category)?.length ?? 0;
       return sum + this.countPaginatedPages(count, maxPostsPerPage);
     }, 0);
 
     const tagPages = Array.from(allTags).reduce((sum, tag) => {
-      const count = posts.filter((post) => (post.tags || []).includes(tag)).length;
+      const count = index.postsByTag.get(tag)?.length ?? 0;
       return sum + this.countPaginatedPages(count, maxPostsPerPage);
     }, 0);
 
     let datePages = 0;
 
     for (const [year] of yearsMap) {
-      const yearPosts = posts.filter((post) => resolvePostCreatedAt(post).getFullYear() === year);
-      datePages += this.countPaginatedPages(yearPosts.length, maxPostsPerPage);
+      const count = index.postsByYear.get(year)?.length ?? 0;
+      datePages += this.countPaginatedPages(count, maxPostsPerPage);
     }
 
     for (const [ym] of yearMonthsMap) {
-      const [yearStr, monthStr] = ym.split('/');
-      const year = Number(yearStr);
-      const month = Number(monthStr);
-      const monthPosts = posts.filter((post) => {
-        const d = resolvePostCreatedAt(post);
-        return d.getFullYear() === year && (d.getMonth() + 1) === month;
-      });
-      datePages += this.countPaginatedPages(monthPosts.length, maxPostsPerPage);
+      const count = index.postsByYearMonth.get(ym)?.length ?? 0;
+      datePages += this.countPaginatedPages(count, maxPostsPerPage);
     }
 
     for (const [ymd] of yearMonthDaysMap) {
-      const [yearStr, monthStr, dayStr] = ymd.split('/');
-      const year = Number(yearStr);
-      const month = Number(monthStr);
-      const day = Number(dayStr);
-      const dayPosts = posts.filter((post) => {
-        const d = resolvePostCreatedAt(post);
-        return d.getFullYear() === year && (d.getMonth() + 1) === month && d.getDate() === day;
-      });
-      datePages += this.countPaginatedPages(dayPosts.length, maxPostsPerPage);
+      const count = index.postsByYearMonthDay.get(ymd)?.length ?? 0;
+      datePages += this.countPaginatedPages(count, maxPostsPerPage);
     }
 
     return {
@@ -1921,6 +1919,52 @@ export class BlogGenerationEngine {
     }
     return Math.max(1, Math.ceil(totalPosts / maxPostsPerPage));
   }
+
+  private buildGenerationPostIndex(posts: PostData[]): GenerationPostIndex {
+    const postsByCategory = new Map<string, PostData[]>();
+    const postsByTag = new Map<string, PostData[]>();
+    const postsByYear = new Map<number, PostData[]>();
+    const postsByYearMonth = new Map<string, PostData[]>();
+    const postsByYearMonthDay = new Map<string, PostData[]>();
+
+    const append = <TKey extends string | number>(target: Map<TKey, PostData[]>, key: TKey, post: PostData) => {
+      const existing = target.get(key);
+      if (existing) {
+        existing.push(post);
+        return;
+      }
+      target.set(key, [post]);
+    };
+
+    for (const post of posts) {
+      for (const category of post.categories || []) {
+        append(postsByCategory, category, post);
+      }
+
+      for (const tag of post.tags || []) {
+        append(postsByTag, tag, post);
+      }
+
+      const createdAt = resolvePostCreatedAt(post);
+      const year = createdAt.getFullYear();
+      const month = String(createdAt.getMonth() + 1).padStart(2, '0');
+      const day = String(createdAt.getDate()).padStart(2, '0');
+      const ym = `${year}/${month}`;
+      const ymd = `${year}/${month}/${day}`;
+
+      append(postsByYear, year, post);
+      append(postsByYearMonth, ym, post);
+      append(postsByYearMonthDay, ymd, post);
+    }
+
+    return {
+      postsByCategory,
+      postsByTag,
+      postsByYear,
+      postsByYearMonth,
+      postsByYearMonthDay,
+    };
+  }
 }
 
 let blogGenerationEngine: BlogGenerationEngine | null = null;
diff --git a/src/main/engine/PreviewServer.ts b/src/main/engine/PreviewServer.ts
index e59c727..fe7e582 100644
--- a/src/main/engine/PreviewServer.ts
+++ b/src/main/engine/PreviewServer.ts
@@ -177,25 +177,12 @@ export class PreviewServer {
       resolveCategorySettings: (metadata) => this.resolveCategorySettings(metadata),
       resolveListExcludedCategories: (settings) => this.resolveListExcludedCategories(settings),
       buildHtmlRewriteContext: () => this.buildHtmlRewriteContext(),
-      resolveRoute: (
-        normalizedPathname,
-        maxPostsPerPage,
-        rewriteContext,
-        pageContext,
-        categorySettings,
-        categoryMetadata,
-        listExcludedCategories,
-        singlePostOptions,
-      ) => this.resolveRoute(
-        normalizedPathname,
-        maxPostsPerPage,
-        rewriteContext,
-        pageContext,
-        categorySettings,
-        categoryMetadata,
-        listExcludedCategories,
-        singlePostOptions,
-      ),
+      pageRenderer: this.pageRenderer,
+      postEngineForMacros: this.postEngine,
+      loadPublishedSnapshotsPage: (filter, pagination) => this.loadPublishedSnapshotsPage(filter, pagination),
+      loadPublishedSnapshots: (filter, pagination) => this.loadPublishedSnapshots(filter, pagination),
+      loadPostsForDayPage: (year, month, day, pagination) => this.loadPostsForDayPage(year, month, day, pagination),
+      findSinglePostBySlug: (slug, singlePostOptions, dateFilter) => this.findSinglePostBySlug(slug, singlePostOptions, dateFilter),
     });
   }
 
diff --git a/src/main/engine/SharedRouteRenderer.ts b/src/main/engine/SharedRouteRenderer.ts
index c259e34..3b4dc25 100644
--- a/src/main/engine/SharedRouteRenderer.ts
+++ b/src/main/engine/SharedRouteRenderer.ts
@@ -4,10 +4,15 @@ import { getPicoStylesheetHref, sanitizePicoTheme } from '../shared/picoThemes';
 import {
   buildTemplateMenuItems,
   clampMaxPostsPerPage,
+  parseRoutePagination,
   resolvePageTitle,
+  type PostEngineContract,
   type CategoryRenderSettings,
   type HtmlRewriteContext,
+  type PageRenderer,
 } from './PageRenderer';
+import type { CategoryMetadata } from './MetaEngine';
+import type { PostData, PostFilter } from './PostEngine';
 
 export interface SharedActiveProjectContext {
   projectId: string;
@@ -26,7 +31,7 @@ export interface SharedRouteRenderOptions {
   singlePostOptions?: { useDraftContent?: boolean; draftPostId?: string };
 }
 
-export interface SharedRouteRenderServices<CategoryMetadata> {
+export interface SharedRouteRenderServices<TCategoryMetadata> {
   postEngine: {
     setProjectContext: (projectId: string, dataDir?: string) => void;
   };
@@ -46,32 +51,221 @@ export interface SharedRouteRenderServices<CategoryMetadata> {
     setProjectContext: (projectId: string, dataDir?: string) => void;
     getMenu: () => Promise<MenuDocument>;
   };
-  resolveCategoryMetadata: (metadata: ProjectMetadata | null) => Record<string, CategoryMetadata>;
+  resolveCategoryMetadata: (metadata: ProjectMetadata | null) => Record<string, TCategoryMetadata>;
   resolveCategorySettings: (metadata: ProjectMetadata | null) => Record<string, CategoryRenderSettings>;
   resolveListExcludedCategories: (settings: Record<string, CategoryRenderSettings>) => string[];
   buildHtmlRewriteContext: () => Promise<HtmlRewriteContext>;
-  resolveRoute: (
-    pathname: string,
-    maxPostsPerPage: number,
-    rewriteContext: HtmlRewriteContext,
-    pageContext: {
-      pageTitle: string;
-      language: string;
-      menuItems: ReturnType<typeof buildTemplateMenuItems>;
-      picoStylesheetHref: string;
-      htmlThemeAttribute?: string;
-    },
-    categorySettings: Record<string, CategoryRenderSettings>,
-    categoryMetadata: Record<string, CategoryMetadata>,
-    listExcludedCategories: string[],
+  pageRenderer: Pick<PageRenderer, 'renderPostList' | 'renderSinglePost'>;
+  postEngineForMacros?: PostEngineContract;
+  loadPublishedSnapshotsPage: (
+    filter: PostFilter,
+    pagination?: { maxPostsPerPage: number; page?: number; excludeCategories?: string[] },
+  ) => Promise<{ posts: PostData[]; totalPosts: number }>;
+  loadPublishedSnapshots: (
+    filter: PostFilter,
+    pagination?: { maxPostsPerPage: number; page?: number; excludeCategories?: string[] },
+  ) => Promise<PostData[]>;
+  loadPostsForDayPage: (
+    year: number,
+    month: number,
+    day: number,
+    pagination?: { maxPostsPerPage: number; page?: number; excludeCategories?: string[] },
+  ) => Promise<{ posts: PostData[]; totalPosts: number }>;
+  findSinglePostBySlug: (
+    slug: string,
     singlePostOptions?: { useDraftContent?: boolean; draftPostId?: string },
-  ) => Promise<string | null>;
+    dateFilter?: { year: number; month: number; day?: number },
+  ) => Promise<PostData | null>;
 }
 
-export async function renderRouteWithSharedContext<CategoryMetadata>(
+async function resolveRouteWithSharedServices(
+  pathname: string,
+  maxPostsPerPage: number,
+  rewriteContext: HtmlRewriteContext,
+  pageContext: {
+    pageTitle: string;
+    language: string;
+    menuItems: ReturnType<typeof buildTemplateMenuItems>;
+    picoStylesheetHref: string;
+    htmlThemeAttribute?: string;
+  },
+  categorySettings: Record<string, CategoryRenderSettings>,
+  categoryMetadata: Record<string, CategoryMetadata>,
+  listExcludedCategories: string[],
+  services: SharedRouteRenderServices<CategoryMetadata>,
+  singlePostOptions?: { useDraftContent?: boolean; draftPostId?: string },
+): Promise<string | null> {
+  const routePagination = parseRoutePagination(pathname);
+  if (!routePagination) {
+    return null;
+  }
+
+  const pagedPathname = routePagination.pathname;
+  const page = routePagination.page;
+  const pageOptions = {
+    maxPostsPerPage,
+    page,
+  };
+
+  if (pagedPathname === '/') {
+    const result = await services.loadPublishedSnapshotsPage({ status: 'published', excludeCategories: listExcludedCategories }, pageOptions);
+    return services.pageRenderer.renderPostList(result.posts, rewriteContext, {
+      archiveGrouping: true,
+      routeKind: 'date',
+      archiveContext: { kind: 'root' },
+      basePathname: pagedPathname,
+      pagination: { page, maxPostsPerPage, totalPosts: result.totalPosts },
+      categorySettings,
+      page_title: pageContext.pageTitle,
+      language: pageContext.language,
+      menu_items: pageContext.menuItems,
+      pico_stylesheet_href: pageContext.picoStylesheetHref,
+      html_theme_attribute: pageContext.htmlThemeAttribute,
+    }, services.postEngineForMacros);
+  }
+
+  const tagMatch = pagedPathname.match(/^\/tag\/([^/]+)$/);
+  if (tagMatch) {
+    const tag = tagMatch[1];
+    const result = await services.loadPublishedSnapshotsPage({ status: 'published', tags: [tag], excludeCategories: listExcludedCategories }, pageOptions);
+    return services.pageRenderer.renderPostList(result.posts, rewriteContext, {
+      archiveGrouping: true,
+      routeKind: 'non-date',
+      archiveContext: { kind: 'tag', name: tag },
+      basePathname: pagedPathname,
+      pagination: { page, maxPostsPerPage, totalPosts: result.totalPosts },
+      categorySettings,
+      page_title: pageContext.pageTitle,
+      language: pageContext.language,
+      menu_items: pageContext.menuItems,
+      pico_stylesheet_href: pageContext.picoStylesheetHref,
+      html_theme_attribute: pageContext.htmlThemeAttribute,
+    }, services.postEngineForMacros);
+  }
+
+  const categoryMatch = pagedPathname.match(/^\/category\/([^/]+)$/);
+  if (categoryMatch) {
+    const category = categoryMatch[1];
+    const categoryDisplayTitle = categoryMetadata[category]?.title?.trim() || category;
+    const result = await services.loadPublishedSnapshotsPage({ status: 'published', categories: [category], excludeCategories: listExcludedCategories }, pageOptions);
+    return services.pageRenderer.renderPostList(result.posts, rewriteContext, {
+      archiveGrouping: true,
+      routeKind: 'non-date',
+      archiveContext: { kind: 'category', name: categoryDisplayTitle },
+      basePathname: pagedPathname,
+      pagination: { page, maxPostsPerPage, totalPosts: result.totalPosts },
+      categorySettings,
+      page_title: pageContext.pageTitle,
+      language: pageContext.language,
+      menu_items: pageContext.menuItems,
+      pico_stylesheet_href: pageContext.picoStylesheetHref,
+      html_theme_attribute: pageContext.htmlThemeAttribute,
+    }, services.postEngineForMacros);
+  }
+
+  const daySlugMatch = pagedPathname.match(/^\/(\d{4})\/(\d{1,2})\/(\d{1,2})\/([^/]+)$/);
+  if (daySlugMatch) {
+    const year = Number(daySlugMatch[1]);
+    const month = Number(daySlugMatch[2]);
+    const day = Number(daySlugMatch[3]);
+    const slug = daySlugMatch[4];
+    const post = await services.findSinglePostBySlug(slug, singlePostOptions, { year, month: month - 1, day });
+    if (!post) return null;
+    return services.pageRenderer.renderSinglePost(post, rewriteContext, {
+      page_title: pageContext.pageTitle,
+      language: pageContext.language,
+      menu_items: pageContext.menuItems,
+      pico_stylesheet_href: pageContext.picoStylesheetHref,
+      html_theme_attribute: pageContext.htmlThemeAttribute,
+    }, services.postEngineForMacros);
+  }
+
+  const dayMatch = pagedPathname.match(/^\/(\d{4})\/(\d{1,2})\/(\d{1,2})$/);
+  if (dayMatch) {
+    const year = Number(dayMatch[1]);
+    const month = Number(dayMatch[2]);
+    const day = Number(dayMatch[3]);
+    const result = await services.loadPostsForDayPage(year, month, day, {
+      ...pageOptions,
+      excludeCategories: listExcludedCategories,
+    });
+    return services.pageRenderer.renderPostList(result.posts, rewriteContext, {
+      archiveGrouping: true,
+      routeKind: 'date',
+      archiveContext: { kind: 'day', year, month, day },
+      basePathname: pagedPathname,
+      pagination: { page, maxPostsPerPage, totalPosts: result.totalPosts },
+      categorySettings,
+      page_title: pageContext.pageTitle,
+      language: pageContext.language,
+      menu_items: pageContext.menuItems,
+      pico_stylesheet_href: pageContext.picoStylesheetHref,
+      html_theme_attribute: pageContext.htmlThemeAttribute,
+    }, services.postEngineForMacros);
+  }
+
+  const monthMatch = pagedPathname.match(/^\/(\d{4})\/(\d{1,2})$/);
+  if (monthMatch) {
+    const year = Number(monthMatch[1]);
+    const month = Number(monthMatch[2]);
+    if (month < 1 || month > 12) return null;
+    const result = await services.loadPublishedSnapshotsPage({ status: 'published', year, month: month - 1, excludeCategories: listExcludedCategories }, pageOptions);
+    return services.pageRenderer.renderPostList(result.posts, rewriteContext, {
+      archiveGrouping: true,
+      routeKind: 'date',
+      archiveContext: { kind: 'month', year, month },
+      basePathname: pagedPathname,
+      pagination: { page, maxPostsPerPage, totalPosts: result.totalPosts },
+      categorySettings,
+      page_title: pageContext.pageTitle,
+      language: pageContext.language,
+      menu_items: pageContext.menuItems,
+      pico_stylesheet_href: pageContext.picoStylesheetHref,
+      html_theme_attribute: pageContext.htmlThemeAttribute,
+    }, services.postEngineForMacros);
+  }
+
+  const yearMatch = pagedPathname.match(/^\/(\d{4})$/);
+  if (yearMatch) {
+    const year = Number(yearMatch[1]);
+    const result = await services.loadPublishedSnapshotsPage({ status: 'published', year, excludeCategories: listExcludedCategories }, pageOptions);
+    return services.pageRenderer.renderPostList(result.posts, rewriteContext, {
+      archiveGrouping: true,
+      routeKind: 'date',
+      archiveContext: { kind: 'year', year },
+      basePathname: pagedPathname,
+      pagination: { page, maxPostsPerPage, totalPosts: result.totalPosts },
+      categorySettings,
+      page_title: pageContext.pageTitle,
+      language: pageContext.language,
+      menu_items: pageContext.menuItems,
+      pico_stylesheet_href: pageContext.picoStylesheetHref,
+      html_theme_attribute: pageContext.htmlThemeAttribute,
+    }, services.postEngineForMacros);
+  }
+
+  const pageSlugMatch = pagedPathname.match(/^\/([^/]+)$/);
+  if (pageSlugMatch) {
+    const slug = pageSlugMatch[1];
+    const pages = await services.loadPublishedSnapshots({ status: 'published', categories: ['page'] }, { maxPostsPerPage });
+    const pagePost = pages.find((candidate) => candidate.slug === slug) || null;
+    if (!pagePost) return null;
+    return services.pageRenderer.renderSinglePost(pagePost, rewriteContext, {
+      page_title: pageContext.pageTitle,
+      language: pageContext.language,
+      menu_items: pageContext.menuItems,
+      pico_stylesheet_href: pageContext.picoStylesheetHref,
+      html_theme_attribute: pageContext.htmlThemeAttribute,
+    }, services.postEngineForMacros);
+  }
+
+  return null;
+}
+
+export async function renderRouteWithSharedContext<TCategoryMetadata>(
   pathname: string,
   options: SharedRouteRenderOptions,
-  services: SharedRouteRenderServices<CategoryMetadata>,
+  services: SharedRouteRenderServices<TCategoryMetadata>,
 ): Promise<string | null> {
   services.postEngine.setProjectContext(options.projectContext.projectId, options.projectContext.dataDir);
   services.mediaEngine.setProjectContext?.(options.projectContext.projectId, options.projectContext.dataDir, options.projectContext.dataDir);
@@ -101,11 +295,11 @@ export async function renderRouteWithSharedContext<CategoryMetadata>(
   const htmlRewriteContext = await services.buildHtmlRewriteContext();
   const normalizedPathname = decodeURIComponent(pathname.replace(/\/+$/, '') || '/');
 
-  return services.resolveRoute(normalizedPathname, maxPostsPerPage, htmlRewriteContext, {
+  return resolveRouteWithSharedServices(normalizedPathname, maxPostsPerPage, htmlRewriteContext, {
     pageTitle,
     language,
     menuItems,
     picoStylesheetHref,
     htmlThemeAttribute: options.htmlThemeAttribute,
-  }, categorySettings, categoryMetadata, listExcludedCategories, options.singlePostOptions);
+  }, categorySettings, categoryMetadata as Record<string, CategoryMetadata>, listExcludedCategories, services as SharedRouteRenderServices<CategoryMetadata>, options.singlePostOptions);
 }
diff --git a/tests/engine/BlogGenerationEngine.test.ts b/tests/engine/BlogGenerationEngine.test.ts
index a9a84c7..9fbecde 100644
--- a/tests/engine/BlogGenerationEngine.test.ts
+++ b/tests/engine/BlogGenerationEngine.test.ts
@@ -640,6 +640,41 @@ describe('BlogGenerationEngine', () => {
     expect(filteredCallCount).toBeLessThanOrEqual(8);
   });
 
+  it('reduces repeated in-memory filtering across category tag and date generation', async () => {
+    const posts: PostData[] = [];
+    for (let i = 0; i < 30; i += 1) {
+      const month = (i % 6) + 1;
+      const day = (i % 5) + 1;
+      posts.push(makePost({
+        id: `perf-${i}`,
+        slug: `perf-${i}`,
+        categories: [`cat-${i % 10}`],
+        tags: [`tag-${i % 10}`],
+        createdAt: new Date(`2025-${String(month).padStart(2, '0')}-${String(day).padStart(2, '0')}T10:00:00Z`),
+      }));
+    }
+
+    setupPosts(posts);
+
+    const filterSpy = vi.spyOn(Array.prototype, 'filter');
+    const { BlogGenerationEngine } = await import('../../src/main/engine/BlogGenerationEngine');
+    const engine = new BlogGenerationEngine();
+
+    await engine.generate({
+      projectId: 'test',
+      projectName: 'Test Blog',
+      dataDir: tempDir,
+      baseUrl: 'https://example.com',
+      maxPostsPerPage: 5,
+      sections: ['category', 'tag', 'date'],
+    }, vi.fn());
+
+    const filterCallCount = filterSpy.mock.calls.length;
+    filterSpy.mockRestore();
+
+    expect(filterCallCount).toBeLessThanOrEqual(750);
+  });
+
   it('validates sitemap against html folder without rendering missing pages', async () => {
     const posts = [
       makePost({