Yes, kids, if you’re finding that the Hyper-V performance ain’t what it used to be since installing that whizbang graphics card driver on your shiny new seven core hyperthread-and-a-halved megaturboserver thing, you might be suffering from flushes.
Read all about it here:
Video performance may decrease when a Windows Server 2008-based computer has the Hyper-V role enabled and an accelerated display adapter installed
KB titles are getting ever more catchy, I think you’ll agree. So many words, and we still couldn’t find space for “is”. Ah well.
So, in short, get back to your standard VGA driver (just uninstalling the whizbang one is typically enough for that) and you’ll be sweet.