[wwwhizz]

Simply run your app in a VM, that should degrade performance, customizable as well.

[virtue3]

I'm not really buying that. You can limit ram access but even at a single core i7 you're going to have better JS performance than some i3 from 10 years ago.

Hypervisor / virtualization tech should mean you get very close to actual host OS performance. Otherwise this whole container thing wouldn't work so hot?