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My observation is the fastest ioc32 data rate led blicks(more speed)
the numbers of encoder read go more crazy.

try adding to the INI:
[DISPLAY]
GRAPHICAL_MAX_FILE_SIZE = 40

i have options to push the poll rate even further with PIO&DMA + using the W5100s interrupt pin.I won't be bored for a few days.

You can low pass filter the outputs
Also for noise and stability I would

1. Run the pots from the 7I73s 3.3V if you can
(Since this is the 7I73s analog input reference the reading
will be ratiometric, so a change in the 3.3V will not change the reading)

2. Low pass filter the inputs at the 7I73 (say with a 0.1 uF capacitor to 7I73 ground)

3. Low pass filter the analog hal signal (a 1 LSB  dither is expected with almost any
A-D at least at some (halfway between) input levels)