Quake 1 on nokia 6120 clic error?

I tried to install quake 1 port for s60v3 (http://koti.mbnet.fi/hinkka/index.html) on nokia 6120 clic, but it doesn't work correctly. I installed PIPS 1.3 and the no fpu version of quake 1 and created the folder quake1 on memory card with all the files. Next I'm rotating the screen with rotateme, and starting the game, but the game is working only for some time. After I'm playing for some time (1 level or sometimes even less) my phone starts to lag, and I can't use any on, only the shutdown on from the top of the phone. What's wrong. I don't have enough RAM, or something, because a lot of people are playing quake 1 on nokia 6120c?