if you want to try it out, I made a js version https://github.com/ashnur/react-sierpinski
updated the old facebook example to new react and added a slider to manipulate how slow the render is
now, deferredUpdates are removed for some reason or another, but I haven't tried it with useMutableSource instead of props yet
https://github.com/facebook/react/pull/13488#issuecomment-416932055 found the reason
https://github.com/ashnur/react-sierpinski/ updated it with a checkbox so you can toggle easily between them
now I should make it publishable because I bet most people don't want to use budo