I've been having this issue for the past ~2 months or so, incredibly frustrating. And forget it being an issue isolated to the site editor: I can't even GET INTO the back-end of my website. My Chrome browser freezes completely solid the moment I click one of the websites I manage in "Account Dashboard", stays frozen for 10 minutes, then crashes. So incredibly frustrating, and using another browser platform is also a time-waster, as Safari doesn't have any of my bookmarks, saved passwords, articles, etc....all of the tools I use to work on websites.
This issue started out of nowhere, and I've tried so many methods to resolve...blocking video autoplay, making sure my ad blocker isn't running, cleaning my cache/cookies as the formal SS guidance for this issue (mentioned by a commenter above), disabling Chrome extensions on SS specifically, etc. I'm running on a MacBook Pro purchased in 2019, with impressively solid Starlink internet with totally above-far upload/download speeds.
Did you ever find a permanent solution, or are you still experiencing the issue?