The Tool Desk
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Measure the pipeline before changing it
A PDF request can spend its time in several independent places. Time them separately so a change to waiting, Chromium lifecycle, or PDF options can be judged against the real bottleneck.
import puppeteer from 'puppeteer';
import { writeFile } from 'node:fs/promises';
const mark = (name, start) => console.log(`${name}: ${Date.now() - start} ms`);
const totalStart = Date.now();
const browserStart = Date.now();
const browser = await puppeteer.launch();
mark('launch', browserStart);
const pageStart = Date.now();
const page = await browser.newPage();
mark('new page', pageStart);
const loadStart = Date.now();
await page.goto('https://example.com/invoice/123', { waitUntil: 'domcontentloaded' });
mark('navigation', loadStart);
const readyStart = Date.now();
await page.waitForSelector('[data-pdf-ready="true"]');
mark('application ready', readyStart);
const pdfStart = Date.now();
const pdf = await page.pdf({ format: 'A4', printBackground: true, waitForFonts: true });
mark('page.pdf', pdfStart);
const writeStart = Date.now();
await writeFile('invoice.pdf', pdf);
mark('write', writeStart);
console.log(`total: ${Date.now() - totalStart} ms`);
await browser.close();Run this against representative documents, not only a trivial page. Include small text-only files, large reports, image-heavy pages, and templates that load web fonts or client-side charts. Record cold and warm runs, median and tail latency, throughput, CPU, memory, PDF size, and visual/text correctness. Keep the Puppeteer and Chrome versions, operating system or container, concurrency, wait condition, and PDF options in the test record. No official Puppeteer source reviewed here publishes a speed multiplier, so any percentage you report should come from your own controlled workload.
Reuse Chromium for repeated jobs
Launching and closing Chromium for every document is simple and matches the standalone pattern in the official PDF guide. A service that generates many files can instead launch once, then create a page or isolated browser context per job. This may reduce repeated startup work, but it is an architecture hypothesis to benchmark rather than a documented guarantee.
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import puppeteer from 'puppeteer';
const browser = await puppeteer.launch();
try {
for (const document of documents) {
const context = await browser.createBrowserContext();
const page = await context.newPage();
try {
await page.setContent(document.html, { waitUntil: 'domcontentloaded' });
await page.waitForSelector('[data-pdf-ready="true"]');
await page.pdf({ path: document.output, format: 'A4' });
} finally {
await context.close();
}
}
} finally {
await browser.close();
}Bound concurrency instead of creating unlimited pages. Add cleanup for every page and context, watch memory over long runs, and decide how to recover from a crashed browser. Context isolation is important when jobs contain different cookies, credentials, or tenant data. Compare this design with one-launch-per-document using the same files and options; measure cold-start latency, sustained throughput, memory growth, crashes, and isolation behavior.
Wait for the document’s real readiness condition
The official guide demonstrates waitUntil: 'networkidle2'. Puppeteer also exposes waitForNetworkIdle(), waitForSelector(), and waitForFunction(). Network-idle waiting includes at least the configured idle period, and pages with analytics, polling, advertisements, or open connections may never become meaningfully idle. A targeted condition can avoid unrelated traffic, but only if it proves that all content required in the PDF is ready.
Use an application-ready marker
await page.goto(url, { waitUntil: 'domcontentloaded' });
await page.waitForSelector('[data-pdf-ready="true"]', { timeout: 30_000 });
await page.pdf({ path: 'report.pdf', format: 'A4' });Your application can set the marker after data, images, and charts finish rendering. If no marker exists, wait for a specific selector or function that represents the completed state.
Use network idle deliberately
await page.goto(url, { waitUntil: 'domcontentloaded' });
await page.waitForNetworkIdle({ idleTime: 500, concurrency: 0, timeout: 30_000 });Do not replace a reliable readiness check merely to reduce elapsed time. Verify that fonts, images, asynchronous data, and chart canvases are present in the resulting PDF.
Understand fonts and print media
By default, Page.pdf() waits for fonts to load. The official guide states: “By default, the Page.pdf() waits for fonts to be loaded.” The current API reference lists waitForFonts: true and ties it to document.fonts.ready. This protects output from fallback fonts, but the documentation does not claim that disabling it is faster.
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await page.pdf({
path: 'report.pdf',
format: 'A4',
waitForFonts: true
});Benchmark waitForFonts: false only when your template uses reliably available fonts, then compare typography and pagination. A small timing change is not useful if text reflows or branding changes.
PDF generation uses the print CSS media type by default. If your layout is designed for screens, set the media type explicitly:
await page.emulateMediaType('screen');
await page.pdf({ path: 'screen-layout.pdf', format: 'A4' });Print CSS and color handling can change the output. Treat media selection as a correctness requirement, not a speed switch.
Reduce rendering work only when the output allows it
PDF options control what Chromium renders; the official reference does not quantify their relative speed. Test each change while keeping the document and environment constant.
| Option | Default or behavior | Possible trade-off |
|---|---|---|
printBackground |
false |
Enabling backgrounds may increase paint work but can be required for branding. |
pageRanges |
All pages | Printing selected pages can reduce output scope when full-document delivery is unnecessary. |
scale |
Configurable | Changing scale affects layout and readability; verify pagination. |
width, height, format |
Configurable paper geometry | Different geometry changes line wrapping and page count. |
timeout |
30,000 ms PDF timeout | A timeout permits longer operations; it does not make them faster. |
Remove unnecessary images, animations, third-party widgets, and data from the HTML itself when requirements permit. Do not assume that blocking a request or lowering image quality is safe without checking the finished PDF.
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A complete, defensive generation function
import puppeteer from 'puppeteer';
export async function htmlToPdf(url, outputPath) {
const browser = await puppeteer.launch();
try {
const page = await browser.newPage();
await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 30_000 });
await page.waitForSelector('[data-pdf-ready="true"]', { timeout: 30_000 });
await page.emulateMediaType('print');
await page.pdf({
path: outputPath,
format: 'A4',
printBackground: true,
waitForFonts: true,
timeout: 30_000
});
} finally {
await browser.close();
}
}For production, add structured timings, cancellation, bounded concurrency, and a retry policy that distinguishes transient navigation failures from deterministic template errors. Keep browser and page lifecycles in finally blocks so a failed job does not leak resources.
Benchmark two key strategy choices
Fresh browser versus warm browser
- Use identical documents, options, and concurrency.
- Separate first-request latency from steady-state throughput.
- Track memory, crashes, cleanup time, and tenant isolation.
- Restart periodically if long-lived processes show growth or instability.
Network idle versus targeted readiness
- Measure elapsed waiting time and tail latency.
- Test pages with polling, analytics, slow images, fonts, and late charts.
- Compare PDF completeness, pagination, and text extraction.
- Choose the faster condition only when it is consistently correct.
Troubleshooting slow or incorrect PDFs
The job always reaches the timeout
Look for a selector that never appears, a JavaScript error, a blocked resource, or a page that keeps making requests. Add logging around navigation and readiness, confirm the marker is actually emitted, and use a targeted wait when network idle is unsuitable. Increasing the 30,000 ms timeout only allows more time; it does not remove the cause.
Fonts or layout differ from the browser
Keep waitForFonts: true, verify the font files are reachable in the deployment environment, and check whether print media rules are changing the design. Use emulateMediaType('screen') only when screen CSS is intentional.
Images or charts are missing
Wait for the application’s completed state rather than only domcontentloaded. Ensure lazy-loaded content is triggered, image URLs are accessible from the Chromium process, and canvases finish drawing before calling page.pdf().
Warm-browser performance degrades
Inspect page and context cleanup, bound concurrency, monitor memory over time, and restart the browser after a measured health threshold. Do not trade isolation for reuse.
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PDF output is unexpectedly large or slow
Check image dimensions and compression, remove unnecessary backgrounds or pages when allowed, and compare file size and visual quality after each change.
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FAQ
Does Puppeteer document an exact speed increase for these changes?
No. The official guide and API references describe behavior and options, not a controlled optimization benchmark.
Is a 30,000 ms timeout a performance target?
No. It is the listed default PDF timeout. A larger value permits slower work but does not accelerate it.
Should every service keep one Chromium process forever?
No. Warm reuse may help repeated jobs, but memory, crashes, cleanup, concurrency, and isolation must be measured for your workload.
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