So is it recommended to have a good cpu to get 60 FPS right?
Not to much CPU as GPU, I've (P4 2.8 GHZ, 1GB RAM, TI 4200 128 GPU) it's an old PC which I almost exclusively use for programming purposes for game I use another PC, anyway on above PC it's run at 60 FPS with "Polygons Edges" disabled otherwise the FPS will go to ~30, so yes you'll have to run the tool on equivalent system or better to have 60 FPS. The tool have that requirement because it shows all bocks of track all the time but GT on PSX shows only few of blocks at the time plus it lower down texture resolution in blocks that faraway to gain some more FPS without those things and some other stuff GT would never be able to run that smoothly on PSX.
What I found out with the older Version of the tool is when its to long open without no use it's crashing.
Thanks for mention it I'll check it out. The newer version doesn't have that issue right?
Greetings Leonidas