Speed & Core Web Vitals
The metrics Google measures on real visitors, what slows a page down and how to make it fast.
- Speed12 min read
CDN basics: what a CDN fixes and what it does not
A CDN puts copies of your files near your visitors and takes TLS, HTTP/2 and compression off your server. What that changes, what it cannot, and how to set one up without caching the wrong pages.Updated 25 Sept 2026 - Speed13 min read
Core Web Vitals for e-commerce: product and category pages
Where shops fail LCP, CLS and INP on product pages, category grids and checkout, with the fix for each template, the WooCommerce and Shopify settings behind them, and how to measure per template.Updated 25 Sept 2026 - Speed14 min read
Core Web Vitals for news and publisher sites: ads, embeds and CLS
Publishers fail Core Web Vitals their own way: unreserved ad slots, banners that push content, embeds that resize, ad tech on the main thread. The fix for each, with code and a per-template checklist.Updated 25 Sept 2026
Fix pages
Core Web Vitals and lab metrics
4 of 8- How to fix Largest Contentful Paint (LCP)High impact.Fixes
lcp+11 min - How to fix Interaction to Next Paint (INP)High impact.Fixes
inp+11 min - How to fix Cumulative Layout Shift (CLS)High impact.Fixes
cls+21 min - How to improve First Contentful Paint (FCP)High impact.Fixes
fcp+11 min
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- How to reduce Time to First Byte (TTFB)High impact.Fixes
ttfb+11 min - How to reduce Total Blocking Time (TBT)High impact.Fixes
tbt1 min - What Speed Index means and how to improve itHigh impact.Fixes
speed-index1 min - How the Lighthouse performance score worksFor information.Fixes
lighthouse-performance-score1 min
Images
3 of 3JavaScript and the main thread
4 of 5- How to reduce unused JavaScriptMedium impact.Fixes
unused-js1 min - How to control third-party script weightMedium impact.Fixes
third-party-weight1 min - How to reduce an excessive DOM sizeMedium impact.Fixes
dom-size1 min - How to avoid long main-thread tasksMedium impact.Fixes
long-tasks1 min
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CSS and fonts
3 of 3Server, compression and caching
3 of 3Check all 30 at once
The Speed test runs every check on this page against your site.