Every extra second of load time costs roughly 7% of conversions.
PHP version
Move to PHP 8.2+ — that change alone is often a 30-40% gain.
Caching
Enable page cache and OPcache. Exclude dynamic pages (cart, checkout) from the cache.
Images
| Format | Use for |
|---|---|
| WebP | Photos |
| SVG | Logos, icons |
Database cleanup
Delete revisions, spam comments, and stale transients.
✅ Measure before and after — otherwise you cannot tell what actually helped.