Switching between saves memory leak?

Today i started my game in 13w24b, went in my creative world to check out the new golden apple effect. then i save and exited and went in to my survival world (it was also first in the menu screen not my creative world that i last loaded) and had a massive fps drop (i was getting 0-4 fps) i pressed f3 and my allocated memory was at 100% and my used at 97% i pressed escape and crashed. next i reload minecraft and went in to my survival and it was working good (35-50 fps) i was to recreate the crash, so i backed out and went in to my creative world then waited a good 30 seconds and then went back in to my survival world and had the same thing happen and took a screen shot. grated my computer isint the best in the world and the creative world is heavily MCEdited with a lot of custom spawners and i always have strength level 126, water breathing 1, Regen 2,resistance 126,fire resistance 1,hast 2,speed 3,and jump boost 3 all for like 99999 seconds if that matters. i have been able to re-create bug this 4 times.