This is just another optimization I found for 100 ticrate servers do with it what you will.

CS:S Client Optimization
Running a 100 tick server costs considerably more than a standard 33 tick server and can be a huge benefit to your gaming experience... if you take advantage of it. If you don't take a minute to make some very simple changes to your local client configuration you will not see any advantage to your performance. The changes outlined below will not kill your system or make it impossible to game on any other servers.

Now, I am the first to admit I don't like tweaking settings I am not familiar with. However, this is important and extremely simple. Here are step by step directions.

Step One: Open Notepad
Notepad or any other text editor is all you need to make these changes.

Step Two: Open Config.cfg
Browse to your \[steam username]\counter-strike source\cstrike\cfg\ directory and open the file named 'config.cfg'.

Step Three: Add Settings
Just to be sure your changes are clean check to verify that each setting does not already exist. If it does not exist just add it. If it does exist just verify the setting is the same.

cl_cmdbackup 2
cl_cmdrate 100
cl_interp 0.01
cl_interpolate 1
cl_lagcomp_errorcheck 1
cl_lagcompensation 1
cl_updaterate 100
cl_smooth 1
rate 30000
max_fps 100

Step Four: Save Config.cfg
Save this file. Keeping a backup of the original config.cfg is a good practice.
Step Five: Frag Away
That's it. You can undo these settings anytime you wish. Just save a copy of your original config.cfg file so you have a little security blanket.