I am sorry to hear that you have issues with the Intel Graphics Controller, please bear in mind our engineering department is aware of this thread and they are currently working to get this issue resolved. I still do not have an estimate time of resolution.
I would like to chime in. I have a new DN2810FYK running Windows 8.1 and using the latest bios and drivers.
The peformance with VC-1 is simply not where it should be or needs to be.