Update/workaround
Ok, an update. If I plug my xp13 laptop with a fresh install of 20.04 into my dell displaylink dock (D6000) and *don't* turn off the laptop monitor, everything is fast and useable. It's only if you either use the display settings to turn off the laptop screen (as you normally would for a docked laptop configuration) or physically close the lid of the laptop that everything goes glacial. Not a perfect fix, but at least it makes things workable again.
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