Can you give us more specific information why the game is slow?
How fast is your CPU/GPU?
Is it a AMD or Nvidia card?
What's the game's PowerPC Frequency set to?
Are your GPU driver's up to date?
Is the New 3D or the legacy engine enabled?
Is your CPU clock rate low or high?
Is anything else taxing your CPU besides Supermodel?
How many cores?
Remember some games have timing/Fps issues(Which is normal. As long as the games fps is displayed 60 fps, it's not your fault) in terms of speed of the games Frame rate. Sometimes it's the emulator. Some may say the hardware is to be blamed.
For more information, check out the Advanced usage on the FAQ page
https://www.supermodel3.com/AdvancedUsage.html and go Power PC clock frequency. You might want to fiddle with the PPC option and see if it helps
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i5-4670k, 3.4 Ghz
Nvidia GeForce GTX 1060 3 GB