You've turned the "Do not pass" Blacklist into a Whitelist.

Quote Originally Posted by triCalcifer
also i have found that running dual screen with all 3 clients on one screen
(30") is faster that running horizontal span with 1 client on main screen
and the 2 others on secondary screen.
This is because you are rendering all three on one screen. If you stay with dual-view and render three across the two screens you'll notice a huge drop in FPS.

If you run three across two screens in Horizontal Span mode, the FPS will be playable.