I can't help but wonder how accurate this is.

^^ that was probably one of the best possible comments i couldve gotten on this

Laggy? That's strange. Could you tell me what browser and OS you're using?

windows 10, tried the applet on both the latest chrome and firefox. it takes like two whole seconds before i can start drawing again after every undo

Thanks for the info. It's super fast for me even on a 10 year old computer, but I'll try to figure out what might be going wrong.