I'm having an issue with both Crysis and Crysis Warhead where both games will run horribly when in full-screen mode, but just fine (100+ fps) when windowed. Performance in full-screen mode is bad to the point where even the EA logo when you start the game is choppy. Not sure if this is an issue that others are experiencing.

Specs are:

6700k processor
16gb DDR4 ram
GTX 1080
Windows 10


I'm running the game on a G-Sync monitor, as well, so it's possible that has something to do with the issue, but I haven't had a chance to look into that, yet.

Check if Vsync enabled. If it is - disable and try to restart in fullscreen.
If it is disabled - enable and restart.

if none of this helps, disable Vsync in game, in control panel for Crysis profile select GSYNC.

See this:
https://www.gog.com/forum/crysis_series/using_desired_resolution_and_refresh_rate_in_fullscreen_ie_1080p_60hz

I tried this; no luck.

Oddly enough, in Crysis, I can hit alt-enter while in full-screen mode, and the game will still display in what I assume is borderless windowed, but run at the proper frame rate.

This doesn't work in Warhead -- it reduces it to a window with a border. I'm also having a weird issue in Warhead where some of the audio is garbled. Like, there's a weird clicking noise that plays. This happens on the menus and in-game.