What is your current config?
I mean you complain the game have bad performances, but you don't have the minimum required config to play the game:
MINIMUM:
Requires a 64-bit processor and operating system
OS: 64-bit Windows 10
PROCESSOR: Core i7-6700 or Ryzen 5 1600
MEMORY: 12 GB RAM
GRAPHICS: GeForce GTX 1060 6GB or Radeon RX 580 8GB or Arc A380
DIRECTX: Version 12
STORAGE: 5 GB available space
Yes, I do realize. I mean your *minimum* game requirements are heavier that freaking Forza horizon 5. What I mean is a major advantage of making a game low poly and flat shaded is reduced triangle count and VRAM usage. But since you've dropped the low *POLY* of *POLY* Plaza, there's no point anymore.
The reason something is high poly is to hide the *POLYNESS*. Yes there are polygons but high poly games hide that. Your original game was low poly justifying the POLY in the name bc you can easily identify it. Its like calling GTA 5 *Poly Theft Auto 5* where's the polygons? sure its made up of polygons its not entirely the visible or the point of your game.