Exactly the same issue, I just updated to Mac Sierra 10.12.4.
Connected with 3 external displays and a DELL D3100 Dock.
Was perfect 2 days ago, now is horrible.
Word = unusable
Parallels = unusable
MS Windows = unusable
MS Project = unusable
Plus numerous other applications
I hope there is a solution soon, otherwise I'll have to bin the DELL dock using DisplayLink technology at it's heart and use only one external monitor connected directly to Thunderbolt port.
It's a pity because it was/is a wonderful solution which suited my needs and budget. Don't really want to spend $3000 to get a new mac with 4 thunderbolt ports to run 3 external displays.
Thanks.
31449613 (Apple Bug report was submitted successfully).
Last edited by DisplayLurker; 04-05-2017 at 09:43 AM.
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