Usability and perf experience for me:

- I'm getting about 5 FPS scrolling on a M4 Pro

- Moving a "window" around takes 29% of my CPU, and renders at about 2 fps

- I'm losing about 40% of my screen height for reading (14" laptop screen). So much so none of the article is visible above the fold, just the title and by-line.

- My browser's CMD-F finds things on layers hidden under the current window

- Changing window size via corner drag is also selecting text on other windows, no prevent default.

- Xzibit says: Tabs are bad, so we put some tabs in your tabs?