Guys I've got a big problem

Once i've laid more than 10 notes using the heisenbur, audiotool starts lagging so badly i get demotivated. I cannot get the booster because I'm on a chromebook and one of the libraries it uses is not supported on chrome os, I've closed all my tabs, restarted my chromebook, removed all my extensions but it still lags.

Any ideas? I'll be getting a proper laptop in late July