The first thing to do here , is to take out the FPS(Frames Per Second)Limiter or setting it to a custom value.

Go to the following folder

C:/User/Your Computer/Documents/MyGames/UnrealEngine3/Shootergame/ShooterEngine.ini

Open the ShooterEngine.ini with notepad++ or the texteditor that you prefer (Word , wordpad , notepad etc.pp)
Ctrl+F to open the searchbox , look for: bSmoothframeRate

to unlock simply change: bSmoothframeRate=TRUE to bSmoothframeRate=FALSE
to edit the Frames , simply change the values of the numbers of the following commands(Preferrably a value your CPU+GPU can hold)
(values may differ from yours)

bSmoothFrameRate=TRUE
MinSmoothedFrameRate=125
MaxSmoothedFrame=250

Why would you want to maximise frames?
more frames give alot of advantages.
Anything beneath 60 FPS is atrocious even 60 isn't good for a shooter as fast as Dirty Bomb
Everything above will give you faster movement , further jumps , a higher rate of fire , smoother aim , etc.pp

Keep in Mind that 100FPS are enough , and i do not recommend setting it to 250 if you cannot hold the 250 up.
If your cpu can hold 100 try 125 (if your frames drop beneath 50 take a value that fits)
For example
MaxSmoothedFrameRate=125 , drops in certain situations on 50 change the value to 80 and you won't experience the drop as much.
MaxSmoothedFrameRate=85 , drops to 40 change the value to 60 and you won't experience the drop as much.
etc.pp

Improving the Audio Quality output for fixing Glitched out audio , or dull sounds.

There are 2 things you want to take a look at ,
If your soundcard runs on the Realtek driver , simply open the RealtekHDaudio Manager and change the Equalizer in the Soundeffects menu to Powerful(or w/e you prefer)
The other Method applies to the C:/User/Your Computer/Documents/MyGames/UnrealEngine3/Shootergame/ShooterEngine.ini
Open the searchbox again(CTRL+F) and look for MaxChannels which is listed directly under [XAudio2.XAudio2Device]

Change the following values to what works best for you
MaxChannels=32
CommonAudioPoolSize=0

Maxchannels basicly tells the game how many channels to use for the soundoutput.
32 will work even on horrible cards but some will support higher values.
A higher value will give a better game experience due to the fact that there is more audio that can be played.

You can assign the following numbers to Maxchannels : 16/32/64/128

If you're audio glitches out , try lowering the value to an amount that is supported by your card (32/64)

CommonaudioPoolsize is basicly the audiobuffer , which buffers the audio before the game starts so that it can be played when required.

You can assign the following to Commonaudiopoolsize : 32/64/128/256
You may change the values to whateveryou prefer , but this should fix audio stuttering simply because the audio is instantly available.(Differs from card to card)

Since the texture streaming in the FPS config is turned off , you have to turn it on again.
If it's already enabled in your config there's still work to do no worries.
I do highly recommend turning it on since the Majority of the graphics card will manage it and your fps will increase.(also fixes startup crashes)

Open the searchbox again and search for bUseTextureStreaming and set it to TRUE

after you did that you will have to search for [TextureStreaming]

Poolsize is the VRAM of your GPU in MB
And MemoryMargin is the amount of reserved Space for the textures
i do highly recommend that you set it to about 20% of your actual VRAM
it will look like this. (Values may differ from yours)

[TextureStreaming]
MinTextureResidentMipCount=7
PoolSize=16384
MemoryMargin=4062

Values that can be assigned to texture streaming
1GB = 1024 = MemoryMargin=128
2GB = 2048 = MemoryMargin=256
3GB = 3072 = MemoryMargin=768
4GB = 4096 = MemoryMargin=820
etc.pp

If objectives pop up , higher the rate of streaming.
(Since the game has access to more VRAM the Loading times will also decrease.)

This is usefull for an AMD cpu's , but will also work for Intel cpu's , both will get an increase of the FPS but AMD cpu's will benefit more from it since games are optimized for Intel.

This one will give you an fps boost , and will force the game to use 4/6/8 Cores.
This can be applied before starting the game into the steam launch parameter.
I tested this myself and had an Stable increase of 30-50FPS.

This is usefull since the game forces the entire game on 2 cores( atleast that's what the details in my test said)

To adjust this "little error"
simply copy -cpuCount=4 for 4 Cores , -cpuCount=6 for 6 Cores , -cpuCount=8 For 8 Cores into the Startparameter.
Where can i find the startparameter?
Rightclick on the game , properties / general / set launch options

This applies the instant and will be managed by steam , if it shows you an error of some sort then Start Steam and the Game with admin rights.

Another option that will increase fps , is letting your GPU manage the PHYSX.
Simply edit this in the Radeonpro settings , or the Nvidia equivalent.

You will have to set the ShooterEngine.ini to ReadOnly , and disable whenever you edit then enable it afterwards again.
Running the Game while not read only will revert all changes.

Also if your game seems to lag but your RIG should have no problem running the game , consider updating the following.

Direct X
Visuals C++ 2010 / 2008 (You will need both x64 & x86 for a 64b PC)
Downloading the Complete PHYSX Pack

That's pretty much all there is to it , hope i could help some of you with this quick guide.
And please don't be too harsh this was the first guide i ever wrote.