Reduce FPS?

My parks tend to get jittery around 7000 guests. I have the graphic settings all on low. Is there a way to intentionally reduce FPS, so things still move smoothly with large numbers of guests, just at a slower frame rate? It might be easier to play, rather than full frames for a bit, then stop for a second, then full frame rate again, etc.

It seems a little strange that there should be this particular problem even when I am zoomed in and you can only see a few guests. The game runs fine with fewer guest numbers, so it's not just raw ability to display the moving coasters etc.

I have 16GB RAM and Intel i7 6700HQ @2.6GHz, but it's a laptop with NVidia GTX 960M with 4GB RAM. Task Manager doesn't seem to show anything as maxxed out while running the game - RAM show at 50%, GPU in the 40s, and CPU generally lower.
 
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