Most of common issues with graphics and fps happen due to outdated graphics cards, or outdated drivers for the graphics card.
First you would need to make that your PC meets recommended system requirements.
If it does, you would need to update the graphics card driver to the latest version.
You can download the relevant driver version for your graphics card from the official website:
If you encounter any difficulties with the video card driver update, the following article will help you: How to update graphics card drivers;
Try to launch the game after performing a clean boot.
Try to lower the graphics settings in the game.
Also check the cooling system of your graphics card, as some issue can be caused by the overheat during the game.