Recently I changed the format of audio files to 192k opus.
It was amazing. The great part was its latency.
opus has only about 20 ms of the latency by defalt
while mp3, vorbis, aac, ... all have over 200 ms.
And You can even make it lower to 4~5 ms with additional file size!
I felt some specal feeling which I couldn't have felt like that
even from flac.

I've learned the importance of latency from this experience.
So I decided to use cache everywhere, to use parallel process
everytime I can, ..., etc.
The lower latency, the better.