I'm not sure (having not followed this for the year - only got my Mac a month ago) if this is an additional issue or something implied/stated in (1)-(4)...
That said, one of the other things that is very noticeable is the delay (3-5 seconds depending on the number of attached monitors) when I 3-finger salute into or out of Mission Control. Mission Control comes up almost immediately as soon as I'm disconnected from the DisplayLink device, but has a noticeable "freeze"-all-actions behaviour when I launch or close MC when I'm connected to the DisplayLink device (in my case, one of those little ThinkPad USB-connected "hubs").
I'll suggest labelling this as (5) but apologetic if it's understood as any of (1)-(4).
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