[MrNice]

I did some tests, all with the same process, no setup change:
Directory in SD with inside 7 audio files (see post #276)
Install new build with add-on, go to the directory in the SD, move the selection on the file, wait 15 seconds, read value from ssh/top, move to the next file.
Results:
Build | low CPU% (good files) | High CPU% (bad files)
#19852 (date: 22/Dec) | 15 | 66
#19882 (date: 01/Jan) | 15 | 65
#20173 (date: 01/Feb) | 15 | 69
#0301 | 15 | 70
#0401 | 67 | 69
#0501 | 66 | 81
#0601 | 59 | 62
#0701 | 64 | 64
#0401 | 63 | 66 (again to be sure)
#0726 | 09 | 95 (again to be sure)

My conclusion as a user:
2 type of files
Builds #0501 and #0726 have higher values.

I'll try to find the last change between #0701 and #0726

I found the starting build:

Build | low CPU% (good files) | High CPU% (bad files)
#0712 | 64 | 65
#0713 | 72 | 95

Even there is a difference between "bad" and "good" file (I don't know why) there is also a difference between builds.
I'll try to find out why the difference between files.

A bit different with build #0805;
Good files have CPU usage (kodi.bin) around 10%
Bad files have around 60%
I recall that there is no activity, no play. I run a RPi1 512.

Still the same with build #0815
Have you the same?
Do you know why?