I am experiencing the same issue as outlined here on reddit - namely Facebook is extremely sluggish with the English filter enabled. Disabling it in favour of the EasyList filter immediately rectifies the issue after a page refresh.
I have not used the report tool as it requires screenshots...
If one has chosen to block third-party cookies and send a Do Not Track request using the settings found in Google Chrome, does one benefit from enabling 'Send Do-Not-Tracker header' and 'Self-destructing third-party cookies' in AdGuard's Stealth Mode?
May I suggest a 'Refresh page' button as is found in the browser extensions? It's especially handy as allows one to keep the Filtering Log full screen, without the need to minimise and refresh the page from the browser itself.