I'm considering getting a MBA + two USB screens -- could I ask for more details from you?
-- Did you resolve this issue already?
-- Can you list all of the displays that you have connected and when the slowdown occurs?
e.g. It sounds like:
(1) MBA Attached Display
(2) Display connected via thunderbolt/VGA
(3) Display connected via USB <-- Slowdowns happen at this step
-- or was it:
(1) MBA Attached Display
(2) Display connected via USB
(3) Display connected via USB <-- Slowdowns happen at this step
-- Eddie
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