We are users of the Popup Pro plug in. We own a licence.
We have noticed that our css cache (autoptimize) was increasing in disk size. We investigated and we reached that WPMU Popup pro is changing every request the css files (through the function _prepare_js_or_css in functions-wpmulib.php) This is generting that autoptimize identifies a new css file (even though nothing changed really) and generating a new cache file.
This happens for "every request". We have good traffic, and this generate that we need to control cache files.
Can you explain why you use this css practice and how can I disable it.