Remove Query Strings from Static Resources
Run a WordPress site through GTmetrix or Pingdom a few years back and you’d get scolded for one thing: those ?ver=1.0.0
caching
Set Header Control Max Age
Most slow sites aren’t slow because of one heavy thing. They’re slow because the browser re-downloads the same logo, stylesheet, and
Template Caching Fix WP 4.9
Quick heads up before you copy anything: this one is old. It dates to WordPress 4.9, which shipped back in 2017.