If the game still has unplayable, unstable fps, run your game in lower resolutions. Although see all your attacks in slomo does feel kinda epic sometimes hahaha it's better than having it on 60fps vsync and having your gameplay slow to a slowmo crawl everytime u musou or when there are too many enemies nearby. Also gives u the cinematic feel, as i like to call it :) because that's the fps movies are shown at at the theater. If you don't mind 30fps, set your vsync option to the '2' value. Using Fullscreen mode sometimes gains better performance than using Windowed or Borderless. Also, turning down Anti-aliasing and Shadows quality are ways to make big performance differences in all games. You can test them one by one, but turning Particles off makes a big difference. Lower your graphics settings in game to the lowest. Click 'Properties' Go to Compatibility tab, check the box that says 'Disable fullscreen optimizations'

Right click your dw9.exe in windows explorer.

\ Things to try for all types of Graphic Cards \

Dynasty warriors 8 pc no lag