Google services lag after Safari 15.0 update
After updating to Safari 15.0 all google services seem to lag. Google search on google.com works with problems - half page is displayed, another is blank, when you try to access some webpages, they don't open. Google Ads became very slow and you can't even sometimes change the profile - when clicking on the avatar just nothing happens. Google Sheets also lags sometimes - you literally can't do anything cause it barely scrolls...
I'm on MacOS Catalina right now. Who's experiencing this issue and how to fix it? Clearing browser data and cookies doesn't help. Is it related only to this version of OS, or same happens on BigSur?
MacBook Pro 15″, macOS 10.15