Vlad Yes. It is particularly annoying in video – rotating from horizontal to landscape or switching back has visible lag of a couple seconds.
My guess is the tab side bar tries to load something (a list of all tabs?) into memory and that's causing a wait. Theoretically, loading only the part that would be visible upon entering the side bar should be enough, especially if you don't even know the user will open it yet (just scrolling up in my video reveals bottom url bar, which then has the button to view the side bar, which might load stuff?).
Of course the real solution is for me to use tab groups sooner before they are at >100 per. 🙂
