This sounds crazy but I've tested this several times and it is completely reproduce-able. If a YouTube video is not running in the background Skyrim takes approximately 2 minutes to load and the framerate in the game is very choppy (10 FPS). However, if I have a YouTube video running in the background (it can be finished playing), the game runs with 60+ FPS and is perfectly playable (also loads in seconds).
If I have a stream running the FPS is not as good (about 40 FPS).
If I close the YouTube video while the game is running the FPS then drops back to choppy values.
Does anyone know why this is happening? I have an HP Pavillion Laptop with an ATI Mobility Radeon HD 5650 and the latest versions of my drivers and DirectX with Windows 7 fully updated.