I hate to be blunt here but if you are complaining about 3min builds and 10s start-up times for a dev environment, you are looking at the wrong areas of optimisation.
I can improve the user experience faster and more reliably if i can iterate faster.
While I wouldn’t agree with the sibling comment that says it needs to be measured in milliseconds, I will say that the faster it is, the more motivated I am to work on it as well.