Okay I followed the advice Booker gave and I had little stutter or slowdown on my SSP world.  I did have a world leak in a dimension though..which is funny because on my SSP i haven't even been to the nether so yeah.  I had to re enable the mods to play with my friend on his server and I got the stutter and slowness.  Then it just crashed.  I am not upset thought as I got a few things done and can affirm that those three mods cause a majority of problems but something else can cause world leaks.  From the console it is Thaumcraft unloading aura nodes
				
			 
				
		 
 
		 
		
