Hi I have a Mac Book Pro 17 inch, OSX 10.9.2. Paralells 9.0.24217. I'm using a Windows 8 virtual machine, and now I started to se problems with performance when I'm using dual screen, but only on the mac screen. The mouse is running slow, windows are slow, when I'm typing there is a delay. This is not the case when I'm using the external screen. The Mac screen is set to mimic 1650x1050. Does anyone have an idea to have to solve this very anoying problem? This has not been the case all the time, it has been working very well a long time. this happens to all my virtual machines. It's both when I'm using both screens in full mode and when I'm just using a window.