- It is one licence key (
asset_rules), not three. A customer who pays for defer rules and then finds critical CSS locked has been sold a puzzle. - Hard rails cannot be overridden — not through a setting, not through a filter, not by editing the database. A rule against jQuery or checkout simply never applies.
- Critical CSS: a PHP heuristic extractor, no headless browser.
@font-faceis always kept (a missing face is a flash of invisible text),@keyframesonly when a kept rule references them, output is capped at 14 KB — the first congestion window — and the original stylesheet is always the fallback. The cache is invalidated on theme switch and plugin update. - Images: sidecars on upload and in bulk, served by the Accept header. Originals are never deleted — hard-coded, not a checkbox.
- Autoload cleanup: options switched to
autoload=noone at a time, each with a backup first, behind a deny-list protecting what WordPress itself needs autoloaded (cron,doing_cron, update transients). Uninstalling restores anything still unreverted, opt-in or not. - Every rule reverts individually, and the whole set switches off with Safe Mode.