I am getting a lag spike every 45 seconds on each of our 150 slot servers. I have poured over all of our code and third party plugins and nothing has a recurring task every 45 seconds, but the timing is very precise at the 45 second mark. I poked through the Bukkit source and saw that every 900 ticks it saves the world and the chunks, is there something about that process that changes that would cause a 400-700ms halt on the server? We are running on a ramdisk so disk I/O should not be a factor. If you need anymore information/have any profiling you would like me to run please let me know.