High CPU usage when using CB for 1.1

Hey,
since upgrading to 1.1 I noticed that my server uses 20% CPU instead of 0-1% when no player is online.
First I thought that a plugin might be causing this but after removing all of them I still have this problem.
I also tried it on my local machine where I have the same problem. There it seems to be worse if run under Linux(40%) vs Windows(20%).

Server:
- Intel Xeon E5645 @ 2.40GHz
- Debian Squeeze 64 Bit
- Java 1.6.0_24 (from wheezy)
Local:
-Intel Core 2 Quad Q6600 @ 3.24GHz
-Windows 7 64 Bit with Java 1.6.0_29
-Archlinux 64 Bit with Java 1.6.0_22