At some point you will end up with a maximum, a "best I can do with this code", but it's often a constraint because of the underlying architecture; you can't make Angular any faster, but you can consider shifting to a different framework. You can't make webapps any more memory efficient, but you can consider building a native app. You can't make processing a TB of data on a single computer faster, but you can consider making it a distributed, horizontally scaled task.