Same problem as everyone here. Game used to work fine. Changed the Vsync settings, I use keyboard and mouse only, even disabled all the overlays I had running (steam, nvidia and discord). I've tried graphic settings from high to low. Benchmark says I should be at +100 fps, and I am in game for a bit. But then this massive lag kicks in and it just drops and drops. Sometimes it feels network related: everything will sort of stop moving and then quickly speed up to catch up (usually ending with a sword in my head). But sometimes its just clearly framerate.
Also getting a memory error message when I close For Honor, I'm wondering if it is related. I can post the image if it might help.