diff --git a/src/data/article.test.ts b/src/data/article.test.ts
index 81483fb..534a8da 100644
--- a/src/data/article.test.ts
+++ b/src/data/article.test.ts
@@ -156,6 +156,20 @@ _System overview._`;
 </figure>`);
 });
 
+test("converts asterisk-emphasized image captions to esa figures", () => {
+  const markdown = `![Flow](https://example.com/flow.png)
+*Request flow.*`;
+
+  expect(
+    toEsaMarkdown(markdown, {
+      canonicalUrl: "https://furedea.com/ja/blog/article-publishing/",
+    }),
+  ).toContain(`<figure>
+<img src="https://example.com/flow.png" alt="Flow">
+<figcaption style="text-align: center;"><em>Request flow.</em></figcaption>
+</figure>`);
+});
+
 test("preserves Zenn extension examples inside fenced code blocks", () => {
   const markdown = `\`\`\`markdown
 :::details Example
diff --git a/src/data/article.ts b/src/data/article.ts
index 98e9b5e..e0f5890 100644
--- a/src/data/article.ts
+++ b/src/data/article.ts
@@ -183,18 +183,25 @@ function restoreFencedBlocks(markdown: string, fencedBlocks: string[]): string {
 }
 
 function convertCaptions(markdown: string): string {
-  return markdown.replace(
-    /^!\[([^\]]*)\]\(([^)\s]+)\)\n([_*])(.+)\3$/gmu,
-    (_match, ...captures: string[]) => {
-      const [alt, url, , caption] = captures;
-      return [
-        "<figure>",
-        `<img src="${escapeHtml(url)}" alt="${escapeHtml(alt)}">`,
-        `<figcaption style="text-align: center;"><em>${escapeHtml(caption)}</em></figcaption>`,
-        "</figure>",
-      ].join("\n");
-    },
-  );
+  const captionedImages =
+    /^!\[(?<alt>[^\]]*)\]\((?<url>[^)\s]+)\)\n(?<marker>[_*])(?<caption>.+)\k<marker>$/gmu;
+  let converted = "";
+  let copiedUntil = 0;
+  for (const match of markdown.matchAll(captionedImages)) {
+    const { alt = "", url = "", caption = "" } = match.groups ?? {};
+    converted += markdown.slice(copiedUntil, match.index) + captionFigure(alt, url, caption);
+    copiedUntil = match.index + match[0].length;
+  }
+  return converted + markdown.slice(copiedUntil);
+}
+
+function captionFigure(alt: string, url: string, caption: string): string {
+  return [
+    "<figure>",
+    `<img src="${escapeHtml(url)}" alt="${escapeHtml(alt)}">`,
+    `<figcaption style="text-align: center;"><em>${escapeHtml(caption)}</em></figcaption>`,
+    "</figure>",
+  ].join("\n");
 }
 
 function replaceImageUrls(markdown: string, origin: string): string {
diff --git a/tests/performance/performance_report.test.ts b/tests/performance/performance_report.test.ts
index 0cf2585..bbbb375 100644
--- a/tests/performance/performance_report.test.ts
+++ b/tests/performance/performance_report.test.ts
@@ -79,6 +79,17 @@ describe("performance report", () => {
     expect(summary).toContain("1.23 s (1.00–1.50)");
     expect(summary).toContain("| 3 |");
   });
+
+  test("shows the blocking time range in rounded milliseconds", () => {
+    const entry = reportEntry();
+    entry.samples = [
+      { ...entry.metrics, blockingTime: 50.4 },
+      entry.metrics,
+      { ...entry.metrics, blockingTime: 120.6 },
+    ];
+
+    expect(renderPerformanceSummary([entry])).toContain("88 ms (50–121)");
+  });
 });
 
 function reportEntry(): PerformanceReportEntry {
diff --git a/tests/performance/performance_report.ts b/tests/performance/performance_report.ts
index e881a09..07cc449 100644
--- a/tests/performance/performance_report.ts
+++ b/tests/performance/performance_report.ts
@@ -21,6 +21,18 @@ export type PerformanceReportEntry = {
 
 export type PerformanceMeasurement = Omit<PerformanceReportEntry, "status">;
 
+type Unit = {
+  format: (milliseconds: number) => string | number;
+  symbol: string;
+};
+
+const SECONDS: Unit = {
+  format: (milliseconds) => (milliseconds / 1_000).toFixed(2),
+  symbol: "s",
+};
+
+const MILLISECONDS: Unit = { format: Math.round, symbol: "ms" };
+
 export function renderPerformanceSummary(entries: PerformanceReportEntry[]): string {
   const rows = entries.toSorted(byRoute).map(renderRow);
   return [
@@ -68,9 +80,9 @@ function renderRow(entry: PerformanceReportEntry): string {
       (value) => value.toFixed(3),
     ),
     unitWithRange(
-      { median: metrics.blockingTime, samples: samples.map(({ blockingTime }) => blockingTime) },
-      "ms",
-      Math.round,
+      metrics.blockingTime,
+      samples.map(({ blockingTime }) => blockingTime),
+      MILLISECONDS,
     ),
     `${samples.length} |`,
   ].join(" | ");
@@ -83,24 +95,16 @@ function statusSymbol(entry: PerformanceReportEntry): string {
   return "❌";
 }
 
-function seconds(milliseconds: number): string {
-  return (milliseconds / 1_000).toFixed(2);
-}
-
 function secondsWithRange(median: number, samples: number[]): string {
-  return unitWithRange({ median, samples }, "s", seconds);
+  return unitWithRange(median, samples, SECONDS);
 }
 
-function unitWithRange(
-  { median, samples }: { median: number; samples: number[] },
-  unit: string,
-  format: (value: number) => string | number,
-): string {
+function unitWithRange(median: number, samples: number[], unit: Unit): string {
   const minimum = Math.min(...samples);
   const maximum = Math.max(...samples);
-  const formattedMedian = format(median);
-  if (minimum === maximum) return `${formattedMedian} ${unit}`;
-  return `${formattedMedian} ${unit} (${format(minimum)}–${format(maximum)})`;
+  const formattedMedian = unit.format(median);
+  if (minimum === maximum) return `${formattedMedian} ${unit.symbol}`;
+  return `${formattedMedian} ${unit.symbol} (${unit.format(minimum)}–${unit.format(maximum)})`;
 }
 
 function valueWithRange(