diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index f87bf136..610426e4 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -58,14 +58,17 @@ jobs:
           node-version: 24
           cache: pnpm
 
-      - name: cache Next.js build
+      # Turbopack persists its build cache here (turbopackFileSystemCacheForBuild).
+      # The key is deterministic (no commit SHA) so every PR restores the same
+      # entry — in practice the one `main` last saved, which is the only cache
+      # sibling PRs can all see.
+      - name: cache Turbopack build cache
         uses: actions/cache@v5
         with:
           path: apps/readest-app/.next/cache
-          key: nextjs-web-${{ github.sha }}-${{ hashFiles('pnpm-lock.yaml') }}
+          key: turbo-build-web-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}
           restore-keys: |
-            nextjs-web-${{ github.sha }}-
-            nextjs-web-
+            turbo-build-web-${{ runner.os }}-
 
       - name: install Dependencies
         working-directory: apps/readest-app
@@ -89,9 +92,21 @@ jobs:
         run: |
           pnpm build-web && pnpm check:all
 
+      - name: cache playwright browsers
+        id: playwright-cache
+        uses: actions/cache@v5
+        with:
+          path: ~/.cache/ms-playwright
+          key: playwright-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}
+
       - name: install playwright browsers
         working-directory: apps/readest-app
-        run: npx playwright install --with-deps chromium
+        run: |
+          if [ "${{ steps.playwright-cache.outputs.cache-hit }}" = 'true' ]; then
+            npx playwright install-deps chromium
+          else
+            npx playwright install --with-deps chromium
+          fi
 
       - name: run web e2e tests
         id: web_e2e
@@ -122,20 +137,17 @@ jobs:
           node-version: 24
           cache: pnpm
 
-      - name: cache Next.js build
-        uses: actions/cache@v5
-        with:
-          path: apps/readest-app/.next/cache
-          key: nextjs-test-${{ github.sha }}-${{ hashFiles('pnpm-lock.yaml') }}
-          restore-keys: |
-            nextjs-test-${{ github.sha }}-
-            nextjs-test-
-
       - name: install Dependencies
         working-directory: apps/readest-app
         run: |
           pnpm install && pnpm setup-vendors
 
+      - name: cache apt packages
+        uses: actions/cache@v5
+        with:
+          path: /var/cache/apt/archives
+          key: apt-test-web-${{ runner.os }}
+
       - name: install LuaJIT + busted (for koplugin tests)
         run: |
           sudo apt-get update
@@ -149,9 +161,21 @@ jobs:
           sudo luarocks --lua-version=5.1 install busted
           sudo luarocks --lua-version=5.1 install lsqlite3complete
 
+      - name: cache playwright browsers
+        id: playwright-cache
+        uses: actions/cache@v5
+        with:
+          path: ~/.cache/ms-playwright
+          key: playwright-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}
+
       - name: install playwright browsers
         working-directory: apps/readest-app
-        run: npx playwright install --with-deps chromium
+        run: |
+          if [ "${{ steps.playwright-cache.outputs.cache-hit }}" = 'true' ]; then
+            npx playwright install-deps chromium
+          else
+            npx playwright install --with-deps chromium
+          fi
 
       - name: run web tests
         working-directory: apps/readest-app
@@ -180,14 +204,15 @@ jobs:
           node-version: 24
           cache: pnpm
 
-      - name: cache Next.js build
+      # The tauri tests run `next dev`, whose Turbopack cache lives in
+      # `.next/dev/cache` (a different path from the `next build` cache).
+      - name: cache Turbopack dev cache
         uses: actions/cache@v5
         with:
-          path: apps/readest-app/.next/cache
-          key: nextjs-tauri-${{ github.sha }}-${{ hashFiles('pnpm-lock.yaml') }}
+          path: apps/readest-app/.next/dev/cache
+          key: turbo-dev-tauri-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}
           restore-keys: |
-            nextjs-tauri-${{ github.sha }}-
-            nextjs-tauri-
+            turbo-dev-tauri-${{ runner.os }}-
 
       - name: install Dependencies
         working-directory: apps/readest-app
diff --git a/apps/readest-app/next.config.mjs b/apps/readest-app/next.config.mjs
index eda4b3c7..cad5ea63 100644
--- a/apps/readest-app/next.config.mjs
+++ b/apps/readest-app/next.config.mjs
@@ -27,6 +27,13 @@ const nextConfig = {
     unoptimized: true,
   },
   devIndicators: false,
+  experimental: {
+    // Persist Turbopack's compilation cache to `.next/` so CI can restore it
+    // between runs. Dev caching is on by default since Next 16.1; build
+    // caching is opt-in (beta).
+    turbopackFileSystemCacheForDev: true,
+    turbopackFileSystemCacheForBuild: true,
+  },
   // Configure assetPrefix or else the server won't properly resolve your assets.
   assetPrefix: '',
   reactStrictMode: true,