I’m a long-term Apple user. I’ve been perfectly content using Safari with multiple tabs open most of the time, many of them pinned, on my 2015 Macbook Pro.
Then I uploaded the MacOS, Monterey and discovered that it has crippled the performance of Safari.
I went to all the usual websites to see if my machine had a problem (it doesn’t) and found that Monterey was meant to improve Safari.
I struggled with Safari for almost a week and then downloaded Firejox – which absolutely flies along on Monterey.
So I’ve stopped using Safari. I’ll go back to it when Apple gives me a version that works.
Meanwhile, I recommend anyone having a problem with Safari moves to Firefox.