An error occurred while saving the commentJarosław Tabor commented
Same here. Macbook Air 2020 M1 16/256, Targus DV4K (DOCK180EUZ) connected with high-quality DisplayPort cables (tested with HDMI too) and apple usb-c cable. On 11.6 it's usable only if you think of the external display as a static image. Any kind of work requiring at least 60Hz is almost impossible as you just can't get used to lag. There is no difference if I connect 1 or 2 display monitors (1440p).
I'm using cables that are able to drive 1440p in 170Hz connected directly to Windows laptop without DisplayLink.