I had gotten up to 1000 a few times. Just never getting back to things to close them, mostly. It turned have to have huge performance impact, so I don't do it

I had gotten up to 1000 a few times. Just never getting back to things to close them, mostly. It turned have to have huge performance impact, so I don't do it anymore. I got out of the habit a few years ago. I think since then, browser went to lazy loading of tabs on restart. If you think your system is running slow, cut the number of tabs to under 100, and try again. You may see a huge jump in performance. The one thing that helped me break the habit of not closing tabs was just installing a tab counter extension. Now, if I see it creeping up towards 100, I know it's time to clean house.