![]() ![]() You may find that one change gives you a 2-point Lighthouse improvement and another gives you a 20-point improvement. While you’re doing performance improvement work, it’s important to understand the impact of each change or set of changes. Step 3: Quantify the impact of each change you make Integrate Webpagetest or Lighthouse reports into your CI/CD process, via eg webhooks or GitHub Actions.įor additional precision, run a test multiple times and take the median result. Use a third-party service that offers performance monitoring, such as Calibre or Speedcurve Every time someone opens a pull request or merges into master, a Lighthouse report will be run and the performance score displayed. Gatsby Cloud has Lighthouse performance reports built into its CI/CD. You can put a lot of effort into performance work - but then ship a performance regression that wipes out all your hard work! Site performance monitoring becomes increasingly important the more long-lasting your project is. Google’s official page has more detail on what these metrics are. These tools measure what are known as “Core Web Vitals”, which measure both time to page load and time to page interactivity. Webpagetest tends to be seen as more precise. Lighthouse tends to be seen as more “canonical”. Lighthouse / PageSpeed Insights and Webpagetest are the most common website performance testing tools in the Gatsby community. In order to get a baseline, you need to decide what you consider the “source of truth”. Instead, performance is a system that you put in place to maintain and extend performance gains over time. Part 1: Creating a process for performance improvementsīecause websites are hard to make fast and easy to make slow, performance improvement isn’t just something that takes place at one point in time. This document is a brief guide to improve your Gatsby site’s performance. To paraphrase Tolstoy, all fast websites are alike, but all slow websites are slow in different ways. Step 2: If you're using a CSS-in-JS library, use the Gatsby plugin.Step 6: Consider using the Preact plugin.Step 5: On critical paths, lazy-load below-the-fold components.Step 4: On critical paths, identify unneeded code & components.Step 3: Audit your application-level chunks for components and data that don't need to be on every page.Step 2: Remove unneeded third-party imports from application-level chunks.Step 2: Use the Gatsby Script component to load scripts performantly.Step 1: Remove unneeded and high-cost, low-value scripts.Step 3: Quantify the impact of each change you make.Part 1: Creating a process for performance improvements. ![]()
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