Thank you for your suggestion. Regarding graphics quality, you can now select it in the settings, but the effect might not be very noticeable. This is because the game is already optimized to reduce the load on the graphics card (GPU), particularly since real-time shadow is barely used in scenes. Therefore, there aren't many adjustable graphics settings. If the FPS is still low, we recommend lowering the resolution. This might be more effective than lowering the game quality settings.
Currently, the game can run on Core i5 from recent years, it should run normally assuming there are no bugs.