What are you using that's causing performance issues?

It runs like a dream when playing with the first window. When opening a second window and dragging it around it stutters for a second then resumes back to full speed and every window after is full speed. (I'm assuming that's the browser going: "Oh wait, they really are using those functions every frame, let me spend a moment to optimize them so they're as fast as possible for future executions)

M4 MacBook Pro running safari, in general it's running at about 10 fps when dragging windows around. Chrome seems to perform better but I still get quite a few dropped frames. Most of those long frames are spent deep in the React internals so I'm guessing that's the cause.