First of all Crysis Warhead needs no tweaking or customization of any kind but since this is the PC world, there are always several custom performance, better visual configurations, tweaks and handy tools, available for those who want to utilize them. So hopefully this info will be helpful for some of you folks.

Custom Configurations

PC Games Hardware: "Uber” quality and performance configs

* Increased texture quality.
* Increased range of visibility.
* More details at higher distances.
* More detailed shadows that are visible at greater distances.

Direct download link for the ZIP package

Installation instructions:
- Go to the Crysis Warhead install folder and make a backup copy of the previous autoexec.cfg, if there is one.
- Copy, for example, the "UHQ autoexec.cfg" file into the Crysis Warhead install folder.
- Remove the "UHQ " part from the filename so that it reads as "autoexec.cfg".
- Start the game.

Mster: Performance Custom Config v1.0 | 60-70% more Fps @ Crymod

* 60-70%+ more Fps compared to Enthusiast.
* Beautiful graphics anyway.

Download link and installation instructions

Crysis2142: Ultra-High Config @ Crysis HQ

RapidShare direct download link

C.U.D.A.A.T.S Custom Crysis Config v2.21

Note: For Warhead, it is adviced to not install the included TOD tweak.

UltimaRage: My LVL 4 CCC tweak. For Warhead; NEW CVARS!

- The HDR and SSAO have been tweaked to really bring out a beautiful look in Warhead.

FileFront download link

Tools

Mr.John: Crysis WARHEAD Benchmarking Tool BETA

Direct download link for the RAR package

Tweaks

TweakGuides: Crysis Warhead Tweak Guide

For the most part, tweaking Crysis Warhead and Crysis Wars is almost identical to Crysis. However there are a range of differences that I felt needed to be spelled out, so I've put together this brief guide - to be used in conjunction with the original Crysis Tweak Guide. It should give you everything you need to know to get Crysis Warhead up to speed on your machine.

PCGH exclusive "Uber” quality and performance configs
Mster's Performance Custom Config v1.0 - 60-70% more fps
TweakGuides: Crysis Warhead Tweak Guide

source: www.incrysis.com