Reducing refresh rate fixed it for me
I just upgraded to Sonoma from Ventura, and was having the same issues posted here.
The fix for me was *reducing refresh rate from 100Hz to 60Hz* -- completely resolved the issue.
Hardware:
* MacBook M1 Air (2020)
* DL6100 dock with DisplayLink
* 3 monitors (two standard 1080 screens and one 4k widescreen)
Issues:
* All other non-4k screens worked perfectly fine, but the main 4k screen had extremely laggy scroll and text input specifically, basically unusable
Resolution:
* Updated to latest DisplayLink manager (v1.10)
* Followed one of the other suggestions here around refresh rate, didn't change anything else (still used default resolution, no other system settings changes, etc.)
Hope this helps others.
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