Thanks for posting this up BigJay. I'm the server Admin, and it is a VPS not a dedicated machine. Also the Operating system is Linux not Windows.
This is our list of Bukkit plugins:
[iNFO] Plugins: RecipeManager, WorldEdit, ChopTree, dynmap, CommandBook
These issues started to occur when running 2.0. I presumed some of our users had "leaky" pipes and this was causing the issue. To compound this lag issue it was also brought to my attention about a Crafting 2 Bench dupe bug (that is still present). I went ahead updated the server to 2.1.1 & generated a new world. Immediately after starting the fresh new world up I began to receive "[WARNING] Can't keep up! ... server overloaded?" messages.
Currently the server lag comes and goes. I've gone through and disabled a few buggy and/or un-needed mods to see if that helps our situation.
We've been running our server since 1.0 and this is the first time we haven't been able to track down was is causing the lag. It sounds eerily familiar to pbottb's issues.
These plugins are disabled:
mod_Clevercraft=off
mod_EE=off
mod_IC2AdvancedMachines=off
mod_DoorFix=off
