Guys thanks for your posts. We hit a major I/O bottleneck with the server, one thing I found is ItemCloud was constantly hitting the disk. I've removed that. It looks like the next big offender is iFriend, but I may have stabilized it by throttling ItemCloud. Tuning PockeMine is a tricky thing, I'll keep you updated. In the meantime thank you for your patience.
The server is costing a lot to run, so anyone that can donate would be appreciated, all proceeds will go directly to the server. I'm looking to setup some feedback mechanism so people can see their donations go into the bank for the server so they know there isn't any funny business. If we could get more donators then we can open up a creative server, or plot server, or blockhunt... whatever people want.
Ruler - no problem, thanks for the feedback. I'm hoping when PM1.5 comes out there will be some optimizations, because i've tried throwing more RAM & CPU at the problem with no avail. In fact iFriend is gone because it was partially lagging the server. I had to limit the banking because people were using it to cheat. Not annoyed, welcome the feedback.