You need to change/replace file called GameUserSettings.ini and, optionally, Engine.ini. They are located in path C:\Users\%UserName%\AppData\Local\SamuraiShodown\Saved\Config\WindowsNoEditor

To get to this folder you can do the following:
1. Press Win+R
2. Type %AppData% into the address bar and hit enter.
3. Navigate back to the "Local" folder
4. Navigate to C:\Users\%UserName%\AppData\Local\SamuraiShodown\Saved\Config\WindowsNoEditor
5. Done. You will see the following files:

Download this file and replace GameUserSettings.ini with this file in the folder:
https://drive.google.com/drive/folders/1TTqKo7E0CLV-bw8gcy5XU0K2OWmxOqqS

(This config was made by HD 520 Expert (https://www.youtube.com/watch?v=S8nXxMHce24 )

If the game still can't run at 60 fps with the previous config, try this one:
https://drive.google.com/file/d/1mRtVC1iLBVkuDwgw4i9XnEyWFVphVxBK/view?usp=sharing

If the game still cannot run at 60 fps with the previous config, you will have to replace/change the Engine.ini file.
Download this file and replace Engine.ini with it:
https://drive.google.com/file/d/1MG1ozEOZT7wgNqs1-EftrZLjFRCC9woZ/view?usp=sharing

The two previous configuration files contain the most minimal settings that I could achieve. With them your game will look like this:


With my PC specs (NVIDIA GeForce GT 730, AMD Athlon II X3 455 Processor) , on some maps like Dojo and Gairyu Isle the game runs at a stable 60 fps, but on some others the fps drops to 50.

For GameUserSettings.ini:

• ResolutionQuality - Lowering the value can increase FPS performance by several points. Low values lead to pixelation of the game (as seen in the picture above). Note: Enabling/disabling full screen mode resets the parameter to its original value (100)
  
• bUseVSync - turn on/off VSync (It is recommended to turn it off, as it reduces performance and increases the input log)