Copy/paste runs at ~ 1-7% CPU. Mostly in the lower spectrum of the percentage.while CPU is idle try and do a simple copy-paste operation of a bigger file (on the server). Then watch CPU usage.
It should be very low when doing this file copy.
If u r running PIO then cpu usage would rise very quickly.
This is how I often test these things.
This evening I recorded and watched a LOT at the same time, and I only saw one pixellation flaw. I had minor stutter, but could rewind and the place it stuttered was gone.
Is there a way to see the number of read/write cycles, and not just the data size?