Page Speed & Performance
LCP, CLS, INP optimization, performance monitoring, and speed testing.
- News
A monitoring bug kept fast interactions out of INP for years
SpeedCurve's lux.js sent durationThreshold to the wrong place, so browsers fell back to a 104ms default. Version 4.5.3, published 30 September, carries the fix.
- News
Lazy-loading the hero image delays LCP instead of speeding it up
A lazy hero image waits for layout before the browser requests it. In Calibre's test the request started at 439ms instead of 177ms, and 17% of pages do it.
- News
Cloudflare data shows image downloads are rarely what slows LCP
Cloudflare's public BEACON dataset on BigQuery splits LCP into four stages, and for slow page views, late discovery and render blocking cost more than the download.
- News
Google cut breadcrumbs from mobile results; the links still work
Sitebulb's guide argues breadcrumbs matter for internal linking and crawling after Google's January 2025 mobile change, and lists six BreadcrumbList markup errors.
