Last night I had an issue of massive server log spam, hundreds of messages per second over a few minutes.
The server logs from that time period are available:
http://pastebin.com/6hEeAcgf

This occurred when several fields from several players (same clan) were overlapping in one area.
A player who was not on the access list for their area attempted to enter the zone, and the resulting lag from the bouncer field's sever log commands made it to where the place was unable to issue any commands to teleport away.

I've resolved the issue, for myself, by disabling the 'logging' for entry, though part of the issue still persists.
The 'Player moved too quickly' error continued to persist even after logging was disabled.

Plugins that we use that could have potentially caused this issue, in conjunction with PreciousStones:
NoCheatPlus (Tracks player movement, the bounceback from the bouncer field could generate intense lag)

Update:
After uninstalling NoCheatPlus:
The player is still kicked when they try to move out of the field:

2012-07-13 15:44:03 [WARNING] awesomedave moved too quickly!
2012-07-13 15:44:04 [INFO] [MCBans] awesomedave has disconnected!

However, it doesn't flood the logs with spam or affect server performance.
If I can provide any additional details for this, please let me know.

I am with same problem.
I am receiving debug on console but it is disable. See the image. http://imgur.com/94tCR