[igouy]

"The basic advice regarding response times has been about the same for thirty years :

0.1 second is about the limit for having the user feel that the system is reacting instantaneously, meaning that no special feedback is necessary except to display the result."

https://www.nngroup.com/articles/response-times-3-important-...

[thethirdone]

Originally you asked "is 54.55 ms perceptable?", I say yes. I can tell the difference between 25 ms and 1 ms in my terminal.

That said, I don't think it is worth trying to reduce your startup time to the point where you can't tell the computer took time. Getting "the user [to] feel that the system is reacting instantaneously" is a different and more important goal.

[igouy]

> I can tell the difference between 25 ms and 1 ms

Maybe you are fooling yourself.