New MacOS Sonoma

[Trogdyr]

I was experiencing same issues listed here. Created an account and am posting to share what worked for me.

I have M1 Macbook Pro (no touch bar version). Dell D6000 Dock. 2x external LG 2560x1440 monitors.

>In DisplayLink Manager menu icon, enable experimental 3008x and 2560x modes.
>Go into Mac Display Settings
>Select external monitor
>Toggle "Show All Resolutions"
>IMORTANT - There are now two 1440 resolutions. MAKE SURE the 2560 x 1440 (Low Resolution) is selected. NOT the (Default)
>Select correct hz. I can go up to 75hz on mine, but selected 60hz to save on the dock bandwidth.

The (Low Resolution) was the key to fix mine. If I select (Default) it goes back to crappy lag. Tested with same positive result on 1.8.1 and 1.10. It doesn't matter what version you are on. You made need to restart app or unplug, re-plug in dock to have it propoerly recognize new resolutions.

Hope this helps someone.