Thank you for the suggestions David!
I tried adding both of the following before self.renderWindow.Render() in the .update(values) method:
self.mesh.DataHasBeenGenerated()
self.meshPolyData.Modified()
But that did not work.
I’ll try adding a “print(timestamps)” to check what you’ve said.
It’s difficult to debug this in debug mode in PyCharm, because when the execution is paused in a breakpoint, the window gets updated as is expected.