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Issue drawing moving stimuli only online

URL of experiment: trackedMotion_test [PsychoPy]

Description of the problem:

I’ve previously (about a year ago) made an experiment using PsychoPy 2020.1.3 which tracks the participant’s mouse, and uses this recorded displacement to control a cloud of moving dots (each dot is programmed as a separate visual shape component).

This ran smoothly offline and online over Pavlovia.

I’ve noticed that PsychoPy has been updated since then, so I have recreated the experiment to run with the latest versions. This works fine offline, but now the online version has very jittery motion rather than smooth moving dots.

Has something changed in updates over the past year in how stimuli are drawn online/how the refresh rate is synchronised?

Any ideas on how to fix this would be great.