Actaully, flood protection ain't the only problem.
-FPS drops dramatically (Down to 4 in the worst case)
-Clicking "quit" in the escape menu doesn't do a thing
-Clicking "Disconnect" freezes the whole Blockland
-Saving basically takes forever until the bug is gone, so I cannot really save during the bug
-The positions of all the inventories get messed up on the screen, still staying in their part of the screen though (For example, paint inventory is still in the lower left corner, but slightly off its place and won't go away when it should)
The bug happens only in my own server only for myself and comes in waves. About 20mins from starting the server, it's all fine, but then the bug comes for a minute or two and then goes away and returns again after few minutes.