I'm on an M4 Pro MacBook-- basically the fastest computer you could buy from Apple before today-- and opening/closing the tab sidebar in Safari on Tahoe takes multiple seconds, even if I have only 4-6 tabs open, and seems to drop to 5 FPS. It's comically bad.

It's so bad I switched back to Chrome. I had thought Chrome had a major battery life penalty compared to Safari on Macs, but I checked more up-to-date info and apparently that's outdated.

Never had this problem, been on Tahoe since it released. My safari tabs are buttery, silken smooth.

I have this issue as well on multiple Tahoe Macs. Opening a new Safari window is 500ms to 1000ms. Adding a tab is faster most of the times. But Safari frequently loses tabs turning them into a blank page without a URL. Searching in the passwords app talkes multiple seconds. This is on multiple macs with different icloud accounts even.

I don't have that problem (new Safari window in < 100ms) but I believe you, LOL.

Because I have the problem on 7+ Macs (as in all mine, my kids', my sister's and my dad's (all of which I am primary tech support on)) where if I press ⌘+ to increase the font size on a website, it increases — and then immediately reverts back to the previous size.

Every single time. But only the first time. I just did it on this site to be sure it still happens.

Do it again, and it works.

It's been happening for at least one or two years, across more than one major OS upgrade. ¯\_(ಠ_ಠ)_/¯

Works fine for me. I wonder if you have some extension or script on one of the sites you use slowing down the tab closure.

I’ve been running the macOS 26.4 beta and have none of these issues.

I will say that 26.4 beta 2 was the first time I've regretting using betas since Sonoma beta 2. The Sonoma beta ruined the firmware on my machine and Apple had to replace the logic board; the latest Tahoe beta broke all networking on my machine and I had to erase the installation to fix everything. I've since dropped off the beta train for the time being.

I already left the beta train on my iPhone because I had too many issues getting my grocery apps to allow me to place orders without going to my laptop and doing it in a web browser.

Do you have more info on those crashes (e.g. crashlogs)? I work on Safari and might be able to get that forwarded to other people.

That's objectively false. I use safari all day everyday and have never experience any of that stuff.

This sounds like swap needing to be swapped in and then released. Check your memory usage.