On an optiplex 7020 with ATI Radeon R5 240 card and 2 monitors with DVI connectors (the white connectors) running windows 7.
I have 1 white cable going into the mating connector on the video card. the 2nd white cable is going into a dell supplied DVI to displayport adapter that then connects to the other port on the video card.
When I had just the DVI in the DVI port (1 monitor), the machine was running good. But now that I have the 2 monitors, whenever I do things, windows open slowly. TYping now is fine. But closing windows / opening windows, things happen slowly. I can drag windows around across the 2 screens at normal speed.
Is there some setting I need to tweak?