this morning I updated to the latest DW20 pack, but since then my game starts lagging horribly after about 15-20 minutes till it eventually crashes. it keeps giving this error after that time "Detected leaking worlds in memory. There are 4 worlds that appear to be persisting. A mod is likely caching the world incorrectly" full log is at http://pastebin.com/J1EGe4XZ some other mods I have installed is what's my light level, optifine, armorstatushud, plugins for forestry 2, better anvil, advanced solar panels and monster spawn highlighter I thought it was optifine at first, since I also updated that, so I downgraded back to C3, but that didn't help. what I also noticed is that the portal I had open in my base from my portalgun kept breaking each time I loaded the world after the update, I had to re-open the portal to be able to use it.