I've a clean OMV 5 installation running on a HP thin client t620.
In the GUI the memory usage is only 0.3% of 3.74GB.
Free in the terminal says:
~# free
total used free shared buff/cache available
Mem: 3926400 1134420 1709772 11656 1082208 2578208
Swap: 4090876 0 4090876
Before I installed the flashmemory-plugin the usage was "normal", with the plugin installed and with the plugin removed it's only 0.3%
kr.,
Frepke