FPS lagg

[kisbeethowen]

Hello guys, 
I've got a problem with my fps on my some save.
When I generate a new world, or load a downloaded map, it runs 35-40 FPS on normal Render Distance, with 100% smooth lighting, with fancy graphics, but ive got a survival save, it runs 0-3 FPS on Tiny RD, 0% smooth lighting, and i dont understeand why it lagging massive. 

My Computer:
Intel P4, 3,2Ghz overclocked to 3,35 Ghz
Nvidia Geforce 8600 GT 256 MB
2*1 Gb, 667 Mhz DDR2 RAM

 

[MiniGrief]

Tekkit Classic is very old now and stuff like this is expected to happen, My brother's computer is a beast and he will gain massive lag spikes from all the old mods, etc.