Performance when logged in

@webagenturerding thanks for letting me know about this! Asset CleanUp doesn’t deal as well with non-cached pages because it takes time for it to process all the rules you set (usually between 0.15 and 0.20 seconds). That’s why it works best with a caching plugin with guest users. Asset CleanUp does have a caching mechanism for CSS/JS files to be read quicker (if they are already optimized, it won’t spent time re-optimising them), but it doesn’t have page caching for logged-in users. That’s what plugins such as WP Rocket offer.

There’s no feature to disable the plugin for logged-in users (although you gave me an idea). However, you can do that using a MU plugin with is_user_logged_in(). I suppose you want to have it deactivated whenever a non-admin is logged-in, but keep it active for logged-in admins and whenever you access the Dashboard. Let me know what you would like and I can prepare a PHP snippet that you could put in /wp-content/mu-plugins/ in order to achieve your goal.