To share a few more details, many folks allocate way too much of their available physical RAM to the Technic launcher. If you have 8G of memory, there is no need to allocate 6 of it to the launcher and doing so may actually make your experience much worse. Depending on which mods are in a pack, what textures you use, etc. the java process iteslf can actually use a lot more (java programs, especially big ones like MC tend to act like a gas in that they will expand to fill all the available space). For instance, I run a custom pack that reports 135 mods many of which are big "cornerstone" mods. My system has 8G of physical RAM and I set the launcher to use 1.5G. I have a texture pack that exceeds 80M zipped. Depending on the circumstances I have seen the java process taking as much as 5G of RAM although it usually sits at about 2.5G.
When the java process that is running your client takes too much RAM there isn't enough left over for the rest of the work the operating system needs to do and your whole computer starts running very slowly as a result. Keeping the launcher set to the lowest number you can successfully run your pack/textures/etc. is usually the better option.
I can play tekkit for about 30 sec with a fps of 60. then it goes to 1fps i tryed every thing it does not happen with normal minecraft only with mod packs pls help (it happens with all of the mod packs and not just tekkit i am just posting it on this one because i play tekkit the most please help i would love to play even more then 30 sec lol)
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