CPU eaten up on Windows 10

After ugrading to Windows 10, Minecraft uses up extreme amounts of CPU. When I'm idling, I get 20%, when I move, I get 95%. After returning to Windows 8.1, everything is back to normal. The difference is 50-60fps and 7-15fps. Is there anything I'm missing, or is this purely a bug. As well, I understand Windows 10 is "unsupported", but it's gonna come up someday, so you should probably fix it as soon as possible, or you will be presented with a rude suprise.