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Isn't there a control on the Mach/Toolpath page 'VBO', its my understanding, possibly mistakenly, that turns the toolpath display off altogether.
There are two options on how the tool path is run. Vertex Buffer Objects (aka VBOs, and requires OpenGL version >= 1.5) and the old Mach 3 way. We test for the v1.5 and if the driver supports it, we use VBOs. Typically, using VBOs puts more of the work on the GPU and less on the CPU. But usually, it also lends to smoother video as most graphics cards have faster memory that the RAM that the CPU uses.
pot = analogRead(potPin);
if (potb > pot + 2 || potb < pot - 2)
{
Serial.Send(pot)
potb = pot;
delay(50);
}