High CPU usage on minecraft_server.1.8-pre1.jar

Previous snapshot and minecraft 1.7.10 was 40 to 60 percent cpu with 1 or more users on (on average).

minecraft 1.8 prerelease 1 cpu's are maxed and getting flooded in log file.

[Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 3209ms behind, skipping 64 tick(s)