I have a PI3 with Volumio3 and a 800x480 display (5.5" and not 7") and Peppymeter running not in random mode (I like a specific set of dials!) with cache enabled and I have this memory situation:
MiB Mem : 968.5 total, 107.4 free, 397.3 used, 463.7 buff/cache
So do not use cache mode or do not use random mode, choose one.
I had also some benefits in response times (snappier Volumio interface via web and no issue on the display or in audio reproduction by:
- Adding the Music Service Shield plugin
- Put the audio buffer size to 12 Mb (but this could be a problem of my NAS that is quite heavily used)