Oh god, get rid of NoLagg, it causes more lag than it solves.
Save your current world and start a new one to get an idea if it's the plugins and not the world itself.
Anyway, remove Dynmap and Towny one by one, my best guess it's one of those 2.
Get Spigot if you haven't already. Check for messed up wiring, teleport pipes, quarrys, etc. Clear all the items on the ground.