same problem here on safari 14...chrome works very wellFB is sluggish in safari, runs out of memory often and has other problems. When is apple going to fix this? Upgrading to the latest Safari version did nothing for me. Using FireFox or Chrome and all works well.
Honestly Safari has become junk and it wasn't good to begin with. Im not sure what Apple is doing but it becomes completely unresponsive sometimes. My go to is Brave Browser which is Chrome based anyway. Problem is all my passwords are in Safari so I need start using 1Password again but I was starting to transition away from it and all the passwords in there are old. Ridiculous!!!