yeah....i have to play on superflat map...there i dont have lag so... and a friend told me that maybe that lag is from a chunk loader but i dont know..
I got a Nvidia geforce 8800 video card 1.25 GB , 2GB RAM and i allocate 1 GB on minecraft , processor AMD Athlon dual core 5000+ 2.60GHz, and the crash error tells me that there's not enough memory allocated to minecraft....