- The Screen Space Reflection (SSR) setting is very demanding, and even powerful systems may struggle to keep a high framerate if this setting is set on Ultra. If the issue seems more present while it's night and raining in the game, please try reducing this setting to Very High or High in the Graphics settings.
- Another option that you could try to lower is the Extra Details setting. Lowering this parameter may help improving your game's performance.
- If you are using the Ultra texture pack and you have a SLI or Crossfire set up, keep in mind that while SLI and Crossfire allow two GPU to share computing power, the VRAM doesn't stack: you'll need to have 6GB of ram on both cards for your system to be able to display smoothly the Ultra texture pack. If this is not your case, please try lowering the texture setting.
- As a last resort, please try to lower the display resolution to see if this alleviate the issue.