It might be faster to find a module to play the sound, instead of running an external process. It takes more time to start up a new process than for your program to do something itself.
The time to start up a new process is short and predictable. My problem is with latency, which is a long and unpredictable time. (I've also had a lot of problems with Audio::Play in the past, one of which is that it doesn't compile on my Debian system, and it's not available as a precompiled Debian package.)
You could try waking up slightly before you actually want to play the sound, then reading the sound into memory, going into a tight loop briefly, or doing something else that will make sure your program is all ready to go by the time it needs to be.
Sure, I'm just trying to find a way to make my program not be a cpu hog.
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