Crysis 2 is one of the most graphically intensive games so users may be experiencing several different problems with Crysis 2, including crashing, freezing, disconnecting online, lag, errors, artifacts and more. Sit tight while we try to sort out some of that for you.

Crysis 2 Crossfire Makes Screen Brightness / Light Flicker

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Step 1. Update to the latest version of Crysis 2. This fixes the issue for many.
Step 2. Update to the latest Catalyst Drivers here.
Step 3. Download the latest Crossfire Profiles using the link above and going to AMD’s site.
Step 4. If you still have issues, download Radeon Pro and run Crysis 2 with F.E.A.R. Crossfire Settings.

If that does not work and you still have issues, here are your options.

Option 1. Get out of full screen mode. This fixes the problem.
Option 2. Disable crossfire via Catalyst.
Option 3. Wait for additional patching. AMD or Crytek will fix it… it’s just a matter of which will take the initiative.

Crysis 2 Depth of Field Makes Screen Blur/Fuzzy

This is a known issue that Crytek is working on to resolve. Please follow the following steps, as it remedies the problem for some people. You might just have to wait in this case.
Step 1. Make sure your video card drivers are up to date. You can download the latest Nvidia Card Drivers here. You can also download the latest AMD/ATI Drivers here.
Step 2. Check your computer temperatures. A game like this is a sure way to overheat a computer if you do not have the proper cooling set up.
Step 3. If you use AMD/ATI cards, try turning off adaptive anti-aliasing and Catalyst AI.

Crysis 2 Disconnects in Multiplayer and Lags

Step 1. Disable your firewall on your computer. This includes the built in windows firewall.
Step 2. Disable your anti-virus (temporarily at your own risk) and try again.
Step 3. If you have a router, disable the firewall and/or turn on gaming mode if applicable.
Step 4. Use port forwarding to allow connections to work.

How to increase FPS and optimize Crysis 2

(Courtesy of OmniRoguelike)
Step 1. Download the Crysis 2 FPS increasing application here and set everything to high.
Step 2. If necessary, disable AA.

Crysis 2 Has Random Artifacts, Texture Glitches, and Shadow Glitches

This is a known issue. Don’t worry, this is not your fault. This will be fixed through Crytek’s patching process. You should however, do the following…
Step 1. Make sure your video card drivers are up to date. You can download the latest Nvidia Card Drivers here. You can also download the latest AMD/ATI Drivers here.
Step 2. Check your computer temperatures. A game like this is a sure way to overheat a computer if you do not have the proper cooling set up.
Step 3. If you use AMD/ATI cards, try turning off adaptive anti-aliasing and Catalyst AI.

Crysis 2 Randomly Has Frame Rate Stutters and Lags

This is a known issue. Don’t worry, this is not your fault. This will be fixed through a long patching process. You should however, do the following…
Step 1. Make sure your video card drivers are up to date. You can download the latest Nvidia Card Drivers here. You can also download the latest AMD/ATI Drivers here.
Step 2. Check your computer temperatures. A game like this is a sure way to overheat a computer if you do not have the proper cooling set up.
Step 3. If you use AMD/ATI cards, try turning off adaptive anti-aliasing and Catalyst AI.

Crysis 2 AI Doesn’t Respond/Ignores Enemies

This is a known issue. Don’t worry, this is not your fault. This will be fixed through Crytek’s pending game patches.

Crysis 2 System Requirements

Minimum
CPU: 2GHz Core 2 Duo / A64 X2 CPU
Memory: 2GB RAM
Video Card: 8800GT / HD3850, 512MB Video Memory, DX9.0c, Shader Model 3.0,
OS: Windows XP
Running at least 20fps at 1024 x 768 Resolution

Recommended
CPU: 2.66GHz Core 2 Duo / A64 X2 CPU
Memory: 3GB RAM
Video Card: GTX280 / HD4870 1GB Video Memory, DX9.0, Shader Model 3.0/4.0,
OS: Windows XP
Running at least 30fps at 1650 x 1080 Resolution

Highly Recommended
CPU: 3GHz Core i7
Memory: 4GB RAM
Video Card: GTX560Ti / HD4870 X2, 1.8GB Video Memory, DX11, Shader Model 3.0/4.0
OS: Windows 7
Running at 30fps at 1920 x 1200 Resolution