I'm running the game just fine and I dont even have the best system.
Intel Core i5-7400 CPU @ 3.00GHz (4 CPUs), ~3.0GHz
24 GB Ram
NVIDIA GeForce GTX 1050 Ti with 4GB Dedicated Video Memory
on Windows 10
I get between 25 and 30 FPS with all graphic settings maxed and traffic and peds all set to 100
Only get slight FPS dips down to 15 fps at certain locations