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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)

That does not set the rate though, what I did for testing was:

                if (inst->hal->rate > .001) {
                    timer = 1e9 / inst->hal->rate;
                }  else {
                    timer = 1e9 / 1000;  # 1 ms
                }      
 
 

Those *.tmax times are in CPU clock cycles and probably OK
if the CPU is ~3 GHz

First thing, get some thermal paste to put on that processor, and the one before it, both are getting very hot doing not much, some Intel processors will start throttling at 63C, some a bit later, but nearly 70 you are getting seems to high with such medium load.

try this to mesa_modbus.c.tmpl i think works?