I Was play FTB 5 days ago and got the leaking world issue, it got huge frame drops and it was unplayable, then i started making my own custom mod pack, with 25 mods, and i got world leaking again, then i removed and added and removed mods, to see what mod/s was causing the leaks, then I tried just Forge (latest 7.7.1.661), no other mods just forge, then I get the lovely world leaking, so forge in it self is causing a leak, or forge is too well made and Minecraft can't keep up. Yes i am using MultiMC. Yes I have tried allowing Minecraft to run with more RAM, and i still got this issue. Also Every time i removed a mod, (to find which ones leak) i made a new Minecraft instance, so old chunks that form a mod i removed, is not the case, because it was a whole new Minecraft world, and Jar, and everything else. each time. MC version was 1.5.1 (latest).
I am pointing out that forge it self leaks Minecraft worlds, so is forge broken or is Minecraft broken, or is my computer broken?, I have the latest Java (Version 7 Update 21). Please help me.
2013-04-20 09:25:59 [sEVERE] [ForgeModLoader] Detected leaking worlds in memory. There are 2 worlds that appear to be persisting. A mod is likely caching the world incorrectly
2013-04-20 09:25:59 [sEVERE] [ForgeModLoader] The world 1899ef7 (New World) has leaked.
My computer Specs:
Windows 7
Java Version 7 Update 21
Jre 64 bit
Windows 64 bit
Processor: Intel® Core i7-2670QM CPU @ 2.20GHz 2.20GHz
Model HP Pavilion dv6 Notebook PC
Thank you for any help.