Frequently I feel that my framerate of what I see on laptop's screen is slow. What I mean is if you have ever played games, you know that graphical performance is measured in FPS (framerates per second). So in my case, sometimes screen is going from 30FPS to 23FPS roughly speaking, until I click and start moving any window or just wait until it returns to normal state. This however fixes the problem for a short while until it starts again.
Since the video was captured with 15FPS, you won't notice anything but at least it would give you better understanding what i am talking about.
I don't know what causes this slowdown. Processor works fine so maybe it is integrated Intel graphic adapter? I doubt since all drivers are up to date here. Maybe it is because of Windows Aero Theme or every feature enabled in Visual Effects?
UPDATE: I think it has something to do with Intel Turbo Boost enabled. Maybe i should just update BIOS to latest version.
DELL Latitude E6420
Windows 7 Enterprise 64-bit
Intel HD / Nvidia NVS 4200M Dedicated
4GB Of RAM