The part of performance visitors feel most.
THE BASICS
Compress and resize images before they are served Minify CSS and JavaScript Combine files where it helps, testing carefully since this breaks things most often Enable compression and browser caching headers Defer or async scripts that are not needed for initial render
IMAGES
Usually the largest part of a page. Serve appropriately sized images, use modern formats where supported, and lazy load anything below the fold.
FONTS
Each weight is a separate download. Limit to what you actually use, and preload the critical one.
THIRD-PARTY SCRIPTS
Chat widgets, trackers, ad tags and embeds are frequently the slowest part of a page and you control none of their code.
Audit them, remove what does not earn its place, and load the rest asynchronously.
MEASURING
The waterfall view in a performance testing tool shows what loaded, in what order, and how long each took. That identifies the problem far better than an overall score.
TEST ON MOBILE
On a mobile connection, where most visitors are.
