If you have an older PC or are experiencing performance issues in KOFXV on PC, adding "-dx11" to your launch options to force the game into DirectX 11 mode might help you run the game more smoothly. Credits to twitter user @JohnXuandou

To disable V-Sync for KOF XV on PC, it's the same as SFV.

1. Go to the configuration file location: %LOCALAPPDATA%\Local\KOFXV\Saved\Config\WindowsNoEditor
2. Edit Engine.ini with notepad
3. Add this at the end of it:
[SystemSettings]
r.VSync=0
4. Save file

Enjoy lag free KOF!

credits to twitter user @VA11Pato

weird issue I found.
my KOFXV was using only 4 out of 12 threads of CPU. it shouldn't be so by default.

so I changed it to use full CPU thereads & the FPS drops completely gone for both DX12 & DX11. (I still recommend DX11 though). Credits to twitter user @BogardMajeed

KOFXV Potato Mod is done! Check it out on Gamebanana:
https://gamebanana.com/mods/358563