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How to make this belt running in uniform speed?

in Simulation
Here is my sketch:
How to make this belt running in uniform speed?
https://cad.onshape.com/documents/43673a0da24e0c9e62ab9868/w/88b13813022d44800fb0e523/e/647299b45b36c68eeda355b7
0
Comments
It probably just maxes out the computer's performance. When the load goes round the corner, it needs to do more math and slows down. I know of no way to actively control the speed in a way that makes it uniform.
The variation in speed comes from the fact your are moving at a steady angular velocity which results in variable "linear" speed as you go around the corners.
Any reason your "track" (part3) can't be a circle, I think that would help…?