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25 Website Speed Optimization Checklist

October 29, 2026 · 4 min read · By the DollarWise team
25 Website Speed Optimization Checklist
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A slow website quietly costs you visitors, sales, and search rankings. Most people leave a page that takes more than a few seconds to load, and search engines now treat speed as a ranking signal through Core Web Vitals. The good news is that the biggest wins are usually simple: oversized images, unused code, and missing caching do most of the damage, and all of them are fixable without rebuilding your site.

This checklist gives you 25 practical speed checks, ordered from the fixes that matter most to the fine-tuning that comes last. Work through it top to bottom, testing your site after each batch of changes, and you will usually see the largest improvement in the first ten items alone. It is written for website owners, bloggers, and small business owners — no developer jargon, and every item says exactly what to do.

One principle runs through the whole checklist: measure, change one thing, and measure again. Speed work is tempting to do in a big bang — a new theme, a new host, a dozen plugins swapped at once — but then you never learn which change actually helped, and you cannot undo a change that hurt. Treat the checklist as a sequence of small experiments instead. Note your starting scores, work through the image items first, and celebrate the early wins: compressing a handful of hero images often cuts seconds off a page on its own. The later items matter too, but they are polish on a foundation that the first ten items build.

What’s inside this resource

The checklist covers five areas. The first group tackles images and media, which are the single biggest cause of slow pages. Next come code and caching fixes, then server and hosting improvements, followed by Core Web Vitals targets, and finally the ongoing habits that keep a fast site fast. Each item is one clear action, so you can tick items off one at a time or hand the list to a developer as a brief. The downloadable version is the same list in plain text, ready to print or paste into your project notes.

The resource

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  1. Compress every image before upload — aim for under 200 KB per image
  2. Serve images in modern formats (WebP or AVIF) with a fallback
  3. Resize images to the exact display size instead of uploading huge originals
  4. Lazy-load images and videos below the fold
  5. Remove unused images and media from your media library
  6. Minify CSS, JavaScript, and HTML files
  7. Combine CSS and JavaScript files where your platform allows it
  8. Remove unused plugins, themes, and third-party scripts
  9. Defer non-critical JavaScript so it loads after the main content
  10. Enable browser caching with sensible expiry times
  11. Enable GZIP or Brotli compression on your server
  12. Use a content delivery network (CDN) for static assets
  13. Choose a hosting plan with fast server response times (TTFB under 600 ms)
  14. Keep your CMS, theme, and plugins updated to their latest versions
  15. Use a lightweight theme — avoid page builders that bloat every page
  16. Limit fonts: use two families at most, and only the weights you need
  17. Preload your most important font and hero image
  18. Reduce redirects — every redirect adds a round trip
  19. Fix broken links and remove redirect chains
  20. Keep the total page weight under 2 MB where possible
  21. Target Largest Contentful Paint under 2.5 seconds
  22. Target Interaction to Next Paint under 200 milliseconds
  23. Target Cumulative Layout Shift under 0.1 (reserve space for images and ads)
  24. Test on a real mobile device using a 4G connection, not only on desktop
  25. Re-test speed monthly and after every major site change

How to use this resource

Start by measuring your site with a free tool such as PageSpeed Insights or WebPageTest, and write down your scores. Work through the checklist in order, re-testing after each group of changes so you can see what actually helped. Fix images first — they deliver the fastest visible improvement. Then move to caching and code, and only then consider hosting changes. Re-run the checklist every few months, or after adding new plugins, themes, or media, because speed drifts as a site grows.

Download the 25 Website Speed Optimization Checklist

Frequently asked questions

How fast should my website load?

Aim for the main content to appear in under 2.5 seconds on a mobile connection. That is also the threshold for a good Largest Contentful Paint score, one of Google’s Core Web Vitals.

Do I need a developer to use this checklist?

Most items — image compression, plugin cleanup, and caching plugins — need no coding at all. The code items can be handed to a developer as a short brief, or skipped until you have help.

Will speed improvements help my search rankings?

Yes. Page experience is a confirmed ranking signal, and faster pages also reduce bounce rates and increase conversions, which compounds the benefit over time.

#website-speed#seo#checklist
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Written by the DollarWise team

We turn confusing money topics into plain-English guides for beginners. Every article is written to be actionable on day one — no jargon, no hype, no sales pitch.

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