quarry makes my server cpu usage jump to 100%

[Fuunguus]

Title: quarry makes my server cpu usage jump to 100%

Version: 3.0.3/3.0.4

OS: Windows 7 64bit, i7 950 3.2 ghz hyperthreading-off.

Java Version: java 64bit (newest)

Description of Problem:

I run the server on the same computer that I play on.

Error Messages:

Error Log:

[Fuunguus]

The cpu usage jumps to 100% and stays there when I turn the quarry on, and goes back to normal 50% ish when I turn it off. (idle cpu usage is with minecraft running aswell..)

The map I use is imported from a SSP world if that means anything, it is only me and my brother playing on the server. There is no lag, but I am concerned cause my stock fan is getting real crappy, and when this one core jumps to 100% while the others are working hard the cpu gets real hot, like close to 100 degrees C.