Torcs 1.3.1 system requirements

hi, I've just installed Torcs 1.3.1 on my system. While with 1.3.0 I have 
nearly 50 fps, 1.3.1 only gives 3/4 fps!

Has something changed so much in Torcs? I am using opensource radeon drivers 
with Mesa 7.0.3 (Mandriva 2008 Spring).

Thanks

CPU Pentium M 1733MHz
RAM 1,5GB
GPU Ati Radeon X600 Mobility with 64MB

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