Windows 8.1 FPS drop while gameplay

Put the summary of the bug you're having here

Recently updated windows operating system to 8.1 which I thought would not cause any issues with the latest Java application or games

Was playing minecraft for 20 minutes and found that it was frame dropping below 30 FPS which is a 50% drop
Describe what happened here

Steps to Reproduce:
1. Update windows 8 to 8.1
2. Run minecraft application and begin play
3. Wait till chunks load and check current FPS status with graphic unadjusted (Graphics are on fast, clouds off, Vsync on or off, no bobbing etc)

Thank you for your time. I understand if this is not a bug and if it is being rectified currently.