diff --git a/.github/scripts/frontend-js-size.mjs b/.github/scripts/frontend-js-size.mjs
index db83bd888a..ce5fd10deb 100644
--- a/.github/scripts/frontend-js-size.mjs
+++ b/.github/scripts/frontend-js-size.mjs
@@ -91,7 +91,7 @@ function formatDiffPercent(before, after) {
 	if (before == null || before === 0 || after == null || after === 0) return '-';
 	const diff = after - before;
 	if (diff === 0) return `0%`;
-	const percent = Math.round(diff / before * 100);
+	const percent = Math.abs(Math.round(diff / before * 100));
 	return formatColoredDiff(`${percent}%`, diff);
 }
 
@@ -411,7 +411,7 @@ function chunkMarkdownTable(rows, total) {
 		'| --- | ---: | ---: | ---: | ---: |',
 	];
 	if (total != null) {
-		lines.push(`| (total) | ${formatBytes(total.beforeSize)} | ${formatBytes(total.afterSize)} | ${formatBytesDiff(total.beforeSize, total.afterSize)} | ${formatDiffPercent(total.beforeSize, total.afterSize)} |`);
+		lines.push(`| (total) | ${formatBytes(total.beforeSize)} | ${formatBytes(total.afterSize)} | ${formatBytesDiff(total.beforeSize, total.afterSize)} | ${formatDiffPercent(total.beforeSize, total.afterSize).replaceAll('\\%', '\\\\%')} |`);
 		lines.push('| | | | | |');
 	}
 	for (const row of rows) {
@@ -464,14 +464,14 @@ function renderFrontendChunkReport(before, after) {
 
 	return [
 		'<details open>',
-		`<summary>${formatChunkChangeSummary('Diffs', diffSummary)}</summary>`,
+		`<summary>${formatChunkChangeSummary('Chunk size diff', diffSummary)}</summary>`,
 		'',
 		chunkMarkdownTable(diffRows, diffTotal),
 		'',
 		'</details>',
 		'',
 		'<details>',
-		`<summary>${formatChunkChangeSummary('Startup', startupSummary)}</summary>`,
+		`<summary>${formatChunkChangeSummary('Startup chunk size', startupSummary)}</summary>`,
 		'',
 		chunkMarkdownTable(startupRows, startupTotal),
 		'',
@@ -493,11 +493,12 @@ function renderFrontendBundleReport(before, after) {
 	const lines = [
 		...renderVisualizerSummaryTable(before, after),
 		'',
-		'<details>',
-		'<summary>Top 10</summary>',
-		'',
+		//'<details>',
+		//'<summary>Top 10</summary>',
+		//'',
 	];
 
+	/*
 	for (const row of after.hotModules.slice(0, 10)) {
 		lines.push(`- ${code(row.id)}: ${sharePercent(row.renderedLength, after.metrics.renderedLength)} (${formatBytes(row.renderedLength)})`);
 	}
@@ -524,6 +525,7 @@ function renderFrontendBundleReport(before, after) {
 		'',
 		'</details>',
 	);
+	*/
 
 	return lines.join('\n');
 }
@@ -534,17 +536,20 @@ const before = await collectReport(beforeDir);
 const after = await collectReport(afterDir);
 const beforeStats = JSON.parse(await fs.readFile(beforeStatsFile, 'utf8'));
 const afterStats = JSON.parse(await fs.readFile(afterStatsFile, 'utf8'));
+const visualizerArtifactLink = `> [Bundle visualizer HTML](${process.env.FRONTEND_BUNDLE_REPORT_ARTIFACT_URL}) is included in the ${code('frontend-bundle-visualizer')} artifact as ${code('frontend-bundle-visualizer.html')}.`;
 
 const body = [
 	marker,
 	'',
-	`## Frontend Chunk Report`,
+	`## Frontend Bundle Report`,
 	'',
 	renderFrontendChunkReport(before, after),
 	'',
-	'## Frontend Bundle Report',
+	'## Bundle Stats',
 	'',
 	renderFrontendBundleReport(collectVisualizerReport(beforeStats), collectVisualizerReport(afterStats)),
+	'',
+	visualizerArtifactLink,
 ].join('\n');
 
 await fs.writeFile(outFile, body);
diff --git a/.github/workflows/frontend-bundle-report.yml b/.github/workflows/frontend-bundle-report.yml
index e040bc390f..b249fa8a79 100644
--- a/.github/workflows/frontend-bundle-report.yml
+++ b/.github/workflows/frontend-bundle-report.yml
@@ -101,7 +101,6 @@ jobs:
         working-directory: before
         env:
           FRONTEND_BUNDLE_VISUALIZER: 'true'
-          FRONTEND_BUNDLE_VISUALIZER_TEMPLATE: raw-data
           FRONTEND_BUNDLE_VISUALIZER_FILE: ${{ runner.temp }}/frontend-bundle-report/before-stats.json
         run: pnpm --filter frontend run build
 
@@ -120,10 +119,20 @@ jobs:
         working-directory: after
         env:
           FRONTEND_BUNDLE_VISUALIZER: 'true'
-          FRONTEND_BUNDLE_VISUALIZER_TEMPLATE: raw-data
           FRONTEND_BUNDLE_VISUALIZER_FILE: ${{ runner.temp }}/frontend-bundle-report/after-stats.json
+          FRONTEND_BUNDLE_VISUALIZER_HTML_FILE: ${{ runner.temp }}/frontend-bundle-report/frontend-bundle-visualizer.html
         run: pnpm --filter frontend run build
 
+      - name: Upload bundle visualizer
+        if: steps.check-base-visualizer.outputs.supported == 'true'
+        id: upload-bundle-visualizer
+        uses: actions/upload-artifact@v7
+        with:
+          name: frontend-bundle-visualizer
+          path: ${{ runner.temp }}/frontend-bundle-report/frontend-bundle-visualizer.html
+          if-no-files-found: error
+          retention-days: 7
+
       - name: Generate report markdown
         if: steps.check-base-visualizer.outputs.supported == 'true'
         shell: bash
@@ -131,6 +140,7 @@ jobs:
           BASE_SHA: ${{ github.event.pull_request.base.sha }}
           HEAD_SHA: ${{ github.event.pull_request.head.sha }}
           PR_NUMBER: ${{ github.event.pull_request.number }}
+          FRONTEND_BUNDLE_REPORT_ARTIFACT_URL: ${{ steps.upload-bundle-visualizer.outputs.artifact-url }}
         run: |
           REPORT_DIR="$RUNNER_TEMP/frontend-bundle-report"
           node after/.github/scripts/frontend-js-size.mjs before after "$REPORT_DIR/before-stats.json" "$REPORT_DIR/after-stats.json" "$REPORT_DIR/frontend-js-size-report.md"
diff --git a/.github/workflows/test-backend.yml b/.github/workflows/test-backend.yml
index b8eb0e2493..198451c0e9 100644
--- a/.github/workflows/test-backend.yml
+++ b/.github/workflows/test-backend.yml
@@ -19,12 +19,6 @@ on:
       - .github/workflows/test-backend.yml
       - .github/misskey/test.yml
   workflow_dispatch:
-    inputs:
-      force_ffmpeg_cache_update:
-        description: 'Force update ffmpeg cache'
-        required: false
-        default: false
-        type: boolean
 
 jobs:
   unit:
@@ -62,36 +56,9 @@ jobs:
         submodules: true
     - name: Setup pnpm
       uses: pnpm/action-setup@v6.0.3
-    - name: Get current date
-      id: current-date
-      run: echo "today=$(date +'%Y-%m-%d')" >> $GITHUB_OUTPUT
-    - name: Setup and Restore ffmpeg/ffprobe Cache
-      id: cache-ffmpeg
-      uses: actions/cache@v5
-      with:
-        path: |
-          /usr/local/bin/ffmpeg
-          /usr/local/bin/ffprobe
-        # daily cache
-        key: ${{ runner.os }}-ffmpeg-${{ steps.current-date.outputs.today }}
-        restore-keys: |
-          ${{ runner.os }}-ffmpeg-${{ steps.current-date.outputs.today }}
     - name: Install FFmpeg
-      if: steps.cache-ffmpeg.outputs.cache-hit != 'true' || github.event.inputs.force_ffmpeg_cache_update == true
       run: |
-        for i in {1..3}; do
-          echo "Attempt $i: Installing FFmpeg..."
-          curl -s -L https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz -o ffmpeg.tar.xz && \
-          tar -xf ffmpeg.tar.xz && \
-          mv ffmpeg-*-static/ffmpeg /usr/local/bin/ && \
-          mv ffmpeg-*-static/ffprobe /usr/local/bin/ && \
-          rm -rf ffmpeg.tar.xz ffmpeg-*-static/ && \
-          break || sleep 10
-          if [ $i -eq 3 ]; then
-            echo "Failed to install FFmpeg after 3 attempts"
-            exit 1
-          fi
-        done
+        sudo apt install -y ffmpeg
     - name: Use Node.js
       uses: actions/setup-node@v6.4.0
       with:
diff --git a/.github/workflows/test-federation.yml b/.github/workflows/test-federation.yml
index a8b7831f44..0433931531 100644
--- a/.github/workflows/test-federation.yml
+++ b/.github/workflows/test-federation.yml
@@ -15,12 +15,6 @@ on:
       - packages/misskey-js/**
       - .github/workflows/test-federation.yml
   workflow_dispatch:
-    inputs:
-      force_ffmpeg_cache_update:
-        description: 'Force update ffmpeg cache'
-        required: false
-        default: false
-        type: boolean
 
 jobs:
   test:
@@ -37,36 +31,9 @@ jobs:
           submodules: true
       - name: Setup pnpm
         uses: pnpm/action-setup@v6.0.3
-      - name: Get current date
-        id: current-date
-        run: echo "today=$(date +'%Y-%m-%d')" >> $GITHUB_OUTPUT
-      - name: Setup and Restore ffmpeg/ffprobe Cache
-        id: cache-ffmpeg
-        uses: actions/cache@v5
-        with:
-          path: |
-            /usr/local/bin/ffmpeg
-            /usr/local/bin/ffprobe
-          # daily cache
-          key: ${{ runner.os }}-ffmpeg-${{ steps.current-date.outputs.today }}
-          restore-keys: |
-            ${{ runner.os }}-ffmpeg-${{ steps.current-date.outputs.today }}
       - name: Install FFmpeg
-        if: steps.cache-ffmpeg.outputs.cache-hit != 'true' || github.event.inputs.force_ffmpeg_cache_update == true
         run: |
-          for i in {1..3}; do
-            echo "Attempt $i: Installing FFmpeg..."
-            curl -s -L https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz -o ffmpeg.tar.xz && \
-            tar -xf ffmpeg.tar.xz && \
-            mv ffmpeg-*-static/ffmpeg /usr/local/bin/ && \
-            mv ffmpeg-*-static/ffprobe /usr/local/bin/ && \
-            rm -rf ffmpeg.tar.xz ffmpeg-*-static/ && \
-            break || sleep 10
-            if [ $i -eq 3 ]; then
-              echo "Failed to install FFmpeg after 3 attempts"
-              exit 1
-            fi
-          done
+          sudo apt install -y ffmpeg
       - name: Use Node.js
         uses: actions/setup-node@v6.4.0
         with:
diff --git a/packages/frontend/vite.config.ts b/packages/frontend/vite.config.ts
index b1413be0a4..8cf725b1a1 100644
--- a/packages/frontend/vite.config.ts
+++ b/packages/frontend/vite.config.ts
@@ -27,27 +27,29 @@ const extensions = ['.ts', '.tsx', '.js', '.jsx', '.mjs', '.json', '.json5', '.s
 function getBundleVisualizerPlugin(): PluginOption[] {
 	if (process.env.FRONTEND_BUNDLE_VISUALIZER !== 'true') return [];
 
-	const template = process.env.FRONTEND_BUNDLE_VISUALIZER_TEMPLATE === 'markdown'
-		? 'markdown'
-		: process.env.FRONTEND_BUNDLE_VISUALIZER_TEMPLATE === 'raw-data'
-			? 'raw-data'
-			: 'treemap';
-	const defaultFilename = template === 'markdown'
-		? path.resolve(__dirname, '../../built/_frontend_bundle_visualizer_/report.md')
-		: template === 'raw-data'
-			? path.resolve(__dirname, '../../built/_frontend_bundle_visualizer_/stats.json')
-			: path.resolve(__dirname, '../../built/_frontend_bundle_visualizer_/stats.html');
-
-	return [
+	const visualizerOptions = {
+		title: 'Misskey frontend bundle visualizer',
+		gzipSize: true,
+		brotliSize: true,
+		projectRoot: path.resolve(__dirname, '../..'),
+	};
+	const plugins = [
 		visualizer({
-			filename: process.env.FRONTEND_BUNDLE_VISUALIZER_FILE ?? defaultFilename,
-			title: 'Misskey frontend bundle visualizer',
-			template,
-			gzipSize: true,
-			brotliSize: true,
-			projectRoot: path.resolve(__dirname, '../..'),
+			...visualizerOptions,
+			filename: process.env.FRONTEND_BUNDLE_VISUALIZER_FILE,
+			template: 'raw-data',
 		}) as PluginOption,
 	];
+
+	if (process.env.FRONTEND_BUNDLE_VISUALIZER_HTML_FILE != null) {
+		plugins.push(visualizer({
+			...visualizerOptions,
+			filename: process.env.FRONTEND_BUNDLE_VISUALIZER_HTML_FILE,
+			template: 'treemap',
+		}) as PluginOption);
+	}
+
+	return plugins;
 }
 
 /**