Sound Tweak Rpi4

[the_bertrum]

I'm not sure I understand this, is memory usage considered a bad thing?  I have always been under the impression that unused RAM was wasted RAM as loading from RAM is faster than from HD or SD card?
As long as other processes are not starved of RAM & RAM is released allowing future tracks to cache, what is the problem?
I have not tried any of these cache settings being discussed, but if I saw my RAM usage at 90% I wouldn't be concerned.

In general, the memory use isn't an issue you are right, but what it seems to be used for here is to keep data that has already been played for no benefit whatever. I was expecting that the cache would be used to preload data that has yet to be played so that when it came time to decode the data it would be already in memory. This would have conferred a (slight) benefit. So the way this cache seems to have been implemented simply uses up memory for no good reason.

I've completed a few tests that leave me satisfied that the behaviour is the same from SDCARD as it is from NAS. I've gone back to the default version of MPD now since I can't make productive use of all that idle memory I have.