This method only works if you have an on-board gpu and another one in your computer.
If you have a NVDIA graphics card, than this will mostly work for you, or atleast boost your FPS a bit.

• Step One: Right click on your desktop and find "NVDIA Control Panel"
  
  
• Step Two: Find and click on "Manage 3D settings"
  
  
• Step Three: Click on "Program Settings"
  
  
• Step Four: Click on "Select a program to customize" and find WWE 2k18 and select it.
  
  
• Step Five: Click on "Select the preferred graphics processor for this program" Once there, find and click on "High-performance NVIDIA processor" than select okay.

These five steps will gain you FPS in WWE 2k18 If this didnt help your game at all increase with FPS, than you're PC mostly can't handle the game at all. I know as a fact I could run this game, so seeing 10 FPS at the start I knew something was wrong with the settings. So, I fixed it by doing these steps, now I can finally play WWE 2k18 with good FPS.

*Credits to BirdyGurdy*

• Step one: Go to *YourUser*\Documents\wwe2k18\config.ini
  
  
• Step two: Set these things
  denominator = 60
  numerator = 60
  Simple Lightining = on
  Audience Tesselation = off
  
  
• Step three: Save it.
  
  
• Step four: Make the file "read only" by clicking in the file with the right button and checking the box.

*Credits to WolvereeN; Check Last Monday*