Post

Stephen Cooper
@scooper.dev

I am in the process of evaluating the changes in React performance between v18 and v19. Prod fairly stable. Dev 19 is significantly slower. I know we should never measure performance in Dev but in reality a lot of developers are doing just that! Has anyone else noticed this?

Stephen Cooper
@scooper.dev

What makes this even more interesting is that Chrome 136 looks to have improved things. But also the performance only really goes down when DevTools is open.