diff --git a/packages-private/diagnostics-backend/src/report/markdown.ts b/packages-private/diagnostics-backend/src/report/markdown.ts
index 0fe16bf62f..cf4acefae5 100644
--- a/packages-private/diagnostics-backend/src/report/markdown.ts
+++ b/packages-private/diagnostics-backend/src/report/markdown.ts
@@ -70,6 +70,7 @@ function renderMainTableForPhase(base: MemoryReport, head: MemoryReport, phase:
 			formatValue: formatKiBAsMb,
 			absoluteThreshold: memoryColorThresholdKiB,
 		})),
+		{ onlySignificantChanges: true },
 	);
 }
 
@@ -138,7 +139,6 @@ export function renderMemoryReportMarkdown(base: MemoryReport, head: MemoryRepor
 		lines.push('');
 	}
 
-	lines.push(`_Values are median ± MAD (${base.samples.length} base / ${head.samples.length} head samples). Delta is Head - Base. Deltas are highlighted when their absolute value reaches the metric threshold and exceeds 3 × MAD._`);
 	lines.push('');
 
 	const nonConvergedSamples = countNonConvergedMemorySamples(base, head);
diff --git a/packages-private/diagnostics-backend/test/__snapshots__/render-md.md b/packages-private/diagnostics-backend/test/__snapshots__/render-md.md
index 683e25b6a7..890eb2ba92 100644
--- a/packages-private/diagnostics-backend/test/__snapshots__/render-md.md
+++ b/packages-private/diagnostics-backend/test/__snapshots__/render-md.md
@@ -6,9 +6,9 @@
 | **HeapUsed** | 152 MB <br> ± 1 MB | 168 MB <br> ± 1 MB | $\color{orange}{\text{+16 MB}}$<br>$\color{orange}{\text{+10.5\\%}}$ | 1.4 MB |
 | **PSS** | 202 MB <br> ± 1 MB | 218 MB <br> ± 1 MB | $\color{orange}{\text{+16 MB}}$<br>$\color{orange}{\text{+7.9\\%}}$ | 1.4 MB |
 | **USS** | 184 MB <br> ± 1 MB | 200 MB <br> ± 1 MB | $\color{orange}{\text{+16 MB}}$<br>$\color{orange}{\text{+8.7\\%}}$ | 1.4 MB |
-| **External** | 8.2 MB <br> ± 0.1 MB | 8.2 MB <br> ± 0.1 MB | 0 MB<br>0% | 0.1 MB |
 
-_Values are median ± MAD (3 base / 3 head samples). Delta is Head - Base. Deltas are highlighted when their absolute value reaches the metric threshold and exceeds 3 × MAD._
+<small><i>Only metrics showing significant changes are displayed.</i></small>
+
 
 ### V8 Heap Snapshot Statistics
 
diff --git a/packages-private/diagnostics-frontend/src/report.ts b/packages-private/diagnostics-frontend/src/report.ts
index ab85c625f8..c61985f405 100644
--- a/packages-private/diagnostics-frontend/src/report.ts
+++ b/packages-private/diagnostics-frontend/src/report.ts
@@ -37,122 +37,102 @@ function renderBrowserSummaryTable(base: BrowserMetricsReport, head: BrowserMetr
 	return renderMetricComparisonTable(
 		base.samples,
 		head.samples,
-		[
-			{
-				label: '**Requests**',
-				getValue: sample => sample.network.requestCount,
-				formatValue: formatNumber,
-				absoluteThreshold: 1,
-			},
-			{
-				label: '**Encoded network**',
-				getValue: sample => sample.network.totalEncodedBytes,
-				formatValue: formatBytes,
-				absoluteThreshold: 10_000,
-			},
-			{
-				label: '**Decoded body**',
-				getValue: sample => sample.network.totalDecodedBodyBytes,
-				formatValue: formatBytes,
-				absoluteThreshold: 10_000,
-			},
-			{
-				label: '**Same-origin encoded**',
-				getValue: sample => sample.network.sameOriginEncodedBytes,
-				formatValue: formatBytes,
-				absoluteThreshold: 10_000,
-			},
-			{
-				label: '**Third-party encoded**',
-				getValue: sample => sample.network.thirdPartyEncodedBytes,
-				formatValue: formatBytes,
-				absoluteThreshold: 10_000,
-			},
-			{
-				label: '**Script encoded**',
-				getValue: sample => resourceTypeSampleBytes(sample, ['Script']),
-				formatValue: formatBytes,
-				absoluteThreshold: 10_000,
-			},
-			{
-				label: '**Stylesheet encoded**',
-				getValue: sample => resourceTypeSampleBytes(sample, ['Stylesheet']),
-				formatValue: formatBytes,
-				absoluteThreshold: 10_000,
-			},
-			{
-				label: '**Fetch/XHR encoded**',
-				getValue: sample => resourceTypeSampleBytes(sample, ['Fetch', 'XHR']),
-				formatValue: formatBytes,
-				absoluteThreshold: 10_000,
-			},
-			{
-				label: '**Image encoded**',
-				getValue: sample => resourceTypeSampleBytes(sample, ['Image']),
-				formatValue: formatBytes,
-				absoluteThreshold: 10_000,
-			},
-			{
-				label: '**Font encoded**',
-				getValue: sample => resourceTypeSampleBytes(sample, ['Font']),
-				formatValue: formatBytes,
-				absoluteThreshold: 10_000,
-			},
-			{
-				label: '**WebSocket connections**',
-				getValue: sample => sample.network.webSocketConnectionCount,
-				formatValue: formatNumber,
-				absoluteThreshold: 1,
-			},
-			{
-				label: '**WebSocket sent**',
-				getValue: sample => sample.network.webSocketSentBytes,
-				formatValue: formatBytes,
-				absoluteThreshold: 10_000,
-			},
-			{
-				label: '**WebSocket received**',
-				getValue: sample => sample.network.webSocketReceivedBytes,
-				formatValue: formatBytes,
-				absoluteThreshold: 10_000,
-			},
-			{
-				label: '**Page errors**',
-				getValue: sample => sample.diagnostics.pageErrorCount,
-				formatValue: formatNumber,
-				absoluteThreshold: 1,
-			},
-			{
-				label: '**Console log**',
-				getValue: sample => sample.diagnostics.console.log,
-				formatValue: formatNumber,
-				absoluteThreshold: 1,
-			},
-			{
-				label: '**Console warnings**',
-				getValue: sample => sample.diagnostics.console.warning,
-				formatValue: formatNumber,
-				absoluteThreshold: 1,
-			},
-			{
-				label: '**Console errors**',
-				getValue: sample => sample.diagnostics.console.error,
-				formatValue: formatNumber,
-				absoluteThreshold: 1,
-			},
-			{
-				label: '**Console info**',
-				getValue: sample => sample.diagnostics.console.info,
-				formatValue: formatNumber,
-				absoluteThreshold: 1,
-			},
-			{
-				label: '**Page-attributed memory**',
-				getValue: sample => sample.performance.tabMemory.totalBytes,
-				formatValue: formatBytes,
-				absoluteThreshold: 10_000,
-			},
-		],
+		[{
+			label: '**Requests**',
+			getValue: sample => sample.network.requestCount,
+			formatValue: formatNumber,
+			absoluteThreshold: 1,
+		}, {
+			label: '**Encoded network**',
+			getValue: sample => sample.network.totalEncodedBytes,
+			formatValue: formatBytes,
+			absoluteThreshold: 10_000,
+		}, {
+			label: '**Decoded body**',
+			getValue: sample => sample.network.totalDecodedBodyBytes,
+			formatValue: formatBytes,
+			absoluteThreshold: 10_000,
+		}, {
+			label: '**Same-origin encoded**',
+			getValue: sample => sample.network.sameOriginEncodedBytes,
+			formatValue: formatBytes,
+			absoluteThreshold: 10_000,
+		}, {
+			label: '**Third-party encoded**',
+			getValue: sample => sample.network.thirdPartyEncodedBytes,
+			formatValue: formatBytes,
+			absoluteThreshold: 10_000,
+		}, {
+			label: '**Script encoded**',
+			getValue: sample => resourceTypeSampleBytes(sample, ['Script']),
+			formatValue: formatBytes,
+			absoluteThreshold: 10_000,
+		}, {
+			label: '**Stylesheet encoded**',
+			getValue: sample => resourceTypeSampleBytes(sample, ['Stylesheet']),
+			formatValue: formatBytes,
+			absoluteThreshold: 10_000,
+		}, {
+			label: '**Fetch/XHR encoded**',
+			getValue: sample => resourceTypeSampleBytes(sample, ['Fetch', 'XHR']),
+			formatValue: formatBytes,
+			absoluteThreshold: 10_000,
+		}, {
+			label: '**Image encoded**',
+			getValue: sample => resourceTypeSampleBytes(sample, ['Image']),
+			formatValue: formatBytes,
+			absoluteThreshold: 10_000,
+		}, {
+			label: '**Font encoded**',
+			getValue: sample => resourceTypeSampleBytes(sample, ['Font']),
+			formatValue: formatBytes,
+			absoluteThreshold: 10_000,
+		}, {
+			label: '**WebSocket connections**',
+			getValue: sample => sample.network.webSocketConnectionCount,
+			formatValue: formatNumber,
+			absoluteThreshold: 1,
+		}, {
+			label: '**WebSocket sent**',
+			getValue: sample => sample.network.webSocketSentBytes,
+			formatValue: formatBytes,
+			absoluteThreshold: 10_000,
+		}, {
+			label: '**WebSocket received**',
+			getValue: sample => sample.network.webSocketReceivedBytes,
+			formatValue: formatBytes,
+			absoluteThreshold: 10_000,
+		}, {
+			label: '**Page errors**',
+			getValue: sample => sample.diagnostics.pageErrorCount,
+			formatValue: formatNumber,
+			absoluteThreshold: 1,
+		}, {
+			label: '**Console log**',
+			getValue: sample => sample.diagnostics.console.log,
+			formatValue: formatNumber,
+			absoluteThreshold: 1,
+		}, {
+			label: '**Console warnings**',
+			getValue: sample => sample.diagnostics.console.warning,
+			formatValue: formatNumber,
+			absoluteThreshold: 1,
+		}, {
+			label: '**Console errors**',
+			getValue: sample => sample.diagnostics.console.error,
+			formatValue: formatNumber,
+			absoluteThreshold: 1,
+		}, {
+			label: '**Console info**',
+			getValue: sample => sample.diagnostics.console.info,
+			formatValue: formatNumber,
+			absoluteThreshold: 1,
+		}, {
+			label: '**Page-attributed memory**',
+			getValue: sample => sample.performance.tabMemory.totalBytes,
+			formatValue: formatBytes,
+			absoluteThreshold: 10_000,
+		}],
 		{ onlySignificantChanges: true },
 	);
 }
@@ -224,8 +204,6 @@ export function renderFrontendDiagnosticsMarkdown(input: FrontendDiagnosticsMark
 		'',
 		renderBrowserSummaryTable(browser.base, browser.head),
 		'',
-		'<i>Only metrics showing significant changes are displayed.</i>',
-		'',
 		detailedHtmlUrl == null || detailedHtmlUrl === '' ? null : `[View details](${detailedHtmlUrl})`,
 		detailedHtmlUrl == null || detailedHtmlUrl === '' ? null : '',
 		'<details>',
diff --git a/packages-private/diagnostics-frontend/test/__snapshots__/report.md b/packages-private/diagnostics-frontend/test/__snapshots__/report.md
index 144ff18305..922c360807 100644
--- a/packages-private/diagnostics-frontend/test/__snapshots__/report.md
+++ b/packages-private/diagnostics-frontend/test/__snapshots__/report.md
@@ -8,7 +8,7 @@
 | **Script encoded** | 918 KB <br> ± 9 KB | 991 KB <br> ± 9.7 KB | $\color{orange}{\text{+73 KB}}$<br>$\color{orange}{\text{+8\\%}}$ | 13 KB |
 | **Page-attributed memory** | 92 MB <br> ± 900 KB | 99 MB <br> ± 972 KB | $\color{orange}{\text{+7.3 MB}}$<br>$\color{orange}{\text{+8\\%}}$ | 1.3 MB |
 
-<i>Only metrics showing significant changes are displayed.</i>
+<small><i>Only metrics showing significant changes are displayed.</i></small>
 
 [View details](https://example.invalid/html)
 
diff --git a/packages-private/diagnostics-shared/src/metric-table.ts b/packages-private/diagnostics-shared/src/metric-table.ts
index 62f57aa483..00008fb61d 100644
--- a/packages-private/diagnostics-shared/src/metric-table.ts
+++ b/packages-private/diagnostics-shared/src/metric-table.ts
@@ -60,21 +60,26 @@ export function renderMetricComparisonTable<T>(
 	options: MetricComparisonTableOptions = {},
 ): string {
 	const lines: string[] = [];
+	let omitted = false;
 
 	for (const row of rows) {
 		const summary = independentDeltaSummary(baseSamples, headSamples, row.getValue);
 		const significant = isSignificant(summary, row.absoluteThreshold);
-		if (options.onlySignificantChanges === true && !significant) continue;
+		if (options.onlySignificantChanges === true && !significant) {
+			omitted = true;
+			continue;
+		}
 
 		lines.push(`| ${row.label} | ${formatMedian(summary.baseMedian, summary.baseMad, row)} | ${formatMedian(summary.headMedian, summary.headMad, row)} | ${formatDelta(summary, row, significant)} | ${row.formatValue(summary.combinedMad)} |`);
 		if (row.separatorAfter === true) lines.push('| | | | | |');
 	}
 
-	if (lines.length === 0) return '**(No data)**';
+	if (lines.length === 0) return '**(No significant changes)**';
 
 	return [
 		'| Metric | @ Base | @ Head | Δ | MAD |',
 		'| --- | ---: | ---: | ---: | ---: |',
 		...lines,
+		...(omitted ? ['', '<small><i>Only metrics showing significant changes are displayed.</i></small>'] : []),
 	].join('\n');
 }
diff --git a/packages-private/diagnostics-shared/test/metric-table.test.ts b/packages-private/diagnostics-shared/test/metric-table.test.ts
index fb638acf48..f1dcafb092 100644
--- a/packages-private/diagnostics-shared/test/metric-table.test.ts
+++ b/packages-private/diagnostics-shared/test/metric-table.test.ts
@@ -66,7 +66,7 @@ describe('renderMetricComparisonTable', () => {
 		expect(table).not.toContain('\\color{');
 		expect(renderMetricComparisonTable(base, head, [defaultRow], {
 			onlySignificantChanges: true,
-		})).toBe('**(No data)**');
+		})).toBe('**(No significant changes)**');
 	});
 
 	test('renders a no-data marker when no rows are configured', () => {
@@ -74,7 +74,7 @@ describe('renderMetricComparisonTable', () => {
 			samples(100, 100, 100),
 			samples(120, 120, 120),
 			[],
-		)).toBe('**(No data)**');
+		)).toBe('**(No significant changes)**');
 	});
 
 	test('treats the absolute threshold itself as significant', () => {