My targets depend on context but I like client side stuff to be done in under 100ms since that was the limit for a human to feel like the interface is 'instant'

My targets depend on context but I like client side stuff to be done in under 100ms since that was the limit for a human to feel like the interface is 'instant' I learnt at college. There a bunch of tricks you can pull to give that impression even when you have to go over that limit. These days I'm lucky, I only work on an internal web app that is almost entirely served over gig ethernet.