Safari 14 on MacOS 11 freezes.
MacOS 11 with Safari 14.0.3. No extensions. I've tried clearing cache, etc. No improvement.
Firefox works fine, but I prefer to use Safari.
The issue may have to do with how you're delivering ads (which I suspect you already know). This throws a ton of errors right before the freeze occurs. These errors are not present in Firefox so we can assert this is a compatibility issue due to the coding of seekingalpha.com.
Lots of issues with this site overall. Frankly, if I don't see significant improvement over the next 11 months, I do not plan to renew.