Minecraft Forums

Hope this is the right location to be writing this! Recently I got a new computer. when running minecraft it works fine but when i install FTB/Tekkit packs I tried to run them and got a huge amount of lag. On my old computer which is has much less ram and all... tekkit classic runs fine with some lag but playable. When I first played FTB on the new computer I tried out some new mod packs and got way to much lag to even play. I figured it was just something to do with the new minecraft forge/modloader or something like that. But then I went to tekkit saw there's a new version of tekkit and played it. Also got lag. Then I went to tekkit classic and played it worked fine for a few minuets but then it started to lag again. Tekkit classic worked on the old computer, Then I realized had nothing to do with the new versions of FTB/tekkit. Because my old computer could run the old packs fine. See others running same mod packs fine in youtube videos. Old computer has win 7 with maybe 4G ram if that?? New computer is using a ASUA Z87-A motherboard with a I7 4770K core and 16G Ram (Gskill F3-1600C9D-16GXM) Win 8 64bit and a ASUS GTX660 TI vid card. Has been working great testing with other games and fraps are way out there but without my minecraft might as well be a paperweight.

Well, try allocating more RAM and setting a higher CPU priority to start. If that doesn't fix it, try adding MaxPermGen size. This was what was stopping me from playing Plus+