Yeah sorry it seems that the jump is tied to the monitor's refresh rate. I just realized now from the comments :( .
Is the run speed also fast/slow for you than what appears here?
Viewing post in Empty Pallete jam comments
Sorry for the inconvenience. Would you please be able to confirm if it is fixed in this build: https://aerial301.itch.io/test-build?secret=1bOamIcHq834fZJ8LOvAP6E