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30ms is pretty close to noticeable for anything that responds to user input. 30ms startup + 20-70ms processing would probably bump you into the noticeable latency range.

People play midi keyboards with 30 ms latency.

Yeah I don’t think 30ms is very noticeable, but say you have a cli tool with other 20-70ms to bump you up to 50-100ms your tool will have noticeable latency. Death by a thousand cuts.

30ms is the absolute best case. Throw some spring in there and you're very quickly at 10s. rub some spring-soap and it's near enough to 60s

And imagine if you start adding sleep calls! Those could take minutes to hours, or even days!

New HN submission: How I Made My Sleep Function Accidentally Quadratic.

It's not about how long someone is willing to wait with a timer and judge it on human timescales, it's about what is an appropriate length of time for the task.

30ms for a program to start, print hello world, and terminate on a modern computer is batshit insane, and it's crazy how many programmers have completely lost sight of even the principle of this.

Java is a tool, a very good one.