Not really if you are running it with Parellels Desktop . I have used it with current generation Air for 1 year , primarily with Visual Studio 2012 90% of the time in Windows 8. Never faced a problem that you are suggesting. Actually this is the only setup that allows me to Run Visual Studio and XCode in the same machine!.Bad idea. Performance issues, improper battery management, choppy drivers. You can use it as a secondary OS to complement the primary one, but if you are planning to run Windows all the time, I wouldn't suggest it.