Server performance issues solved
Over the past month the servers performance has fluctuated wildly and this was due to a memory leak in the latest version of DynMap when using the Super-High Resolution mapping mode.
I believed at the time that once the initial render of our map was complete that the RAM usage would go back to normal. But due to a bug in the software the initial render never completed and the RAM usage stayed very high.
So yesterday I wiped the map and started again. We are now once again using the normal render mode and surprisingly the entire map rendered in about 4 hours and our RAM usage is back to normal. So thank you everyone for your patience!