First check that you meet the minimum requirements needed to run the game, to confirm this please visit this article regarding the requirements for the game.
Updating Video card drivers
If you meet the requirements for the game then please make sure that you have updated the video card drivers for your system to latest version. Below are the links to manufacture of the supported graphics cards.
Change In-Game settings
The settings in Display and Graphics Quality found in the Options menu will have an impact on the performance of the game. Lowering these settings will increase the performance but at the cost of visual quality.
2. Select the Graphics Quality option.
3. From this menu you can you set the Overall Quality to Low as shown in the image below. By doing this you can test the game and see that it is playable at the lowest settings.
4. After the settings for the game have been set to Low you can then continue your saved game.
If this improves the performance issues, feel free to navigate back to the Graphics Quality menu and to find a balance between quality and performance.
Conflict with background programs
By following the steps included in this article, this will help determine if there is a conflict which could be causing your performance issues with the game. This process will start the computer with a minimal set of drivers and start-up programs and can be easily reverted by following the steps listed under "How to return Windows to a normal startup mode."
Verify the game files
Check out this article in order to know how to verify game files.