Laggy cursor on MacBook Air M4 trackpad after macOS Tahoe update

Welcome!

My M4 Pro Macbook Pro is on Tahoe and has no issues with its trackpad. Let's go through the basics:

— If you restart the computer, does the lagginess go away?

— Try a "SMC' reset. See: Reset the SMC of your Mac - Apple Support and use the instruction set labeled, "Mac with Apple Silicon"

— Try going to System Settings > Trackpad and changing the tracking speed to something else, test, then back to your original setting.

— In the same setting, try turning off "force click and haptic feedback." I turned it off on my Macbook Pro not so much because it was bad but rather that I am a klutz. Still, easy enough to check.

— In System Settings > Accessibility, are any of the three options under "Alternative Control Methods" checked. Uncheck them

— Are you perhaps dragging an extra finger when using the trackpad. It's more common that you think. When people use their index finger, there is a natural tendency to curl unused fingers. If one finger does not curl enough...voila! You get an unexpected behavior.

— Have you installed any aftermarket apps than claim to protect, clean, optimize, disinfect, or do the dishes? 99% are useless wallet drainers at best and interfere with the Macs built-in protections.

If those sugestions do not find improvement, I strongly recommend an Apple Store Genius Bar visit to see if they can reproduce the issue.Sometimes, unexpected trackpad or keyboard behavior can be caused by a swelling battery. That's super- rare in a computer as new as yours, but easy enough to check.

Genius Bar Reservation and Apple Support Options - Apple