Do you know what these options do, Deedo?

DropParticleDistortion=False
bAllowDownsampledTranslucency=False
bAllowSeparateTranslucency=False
bEnableVSMShadows=False
bEnableBranchingPCFShadows=False
bUseConservativeShadowBounds=False
HighPrecisionGBuffers=False

not really, bu the game uses the unreal engine, you can find infos for most setting if u search the net.
i only set a few of the options, but i'm sure you can get more if u wana spend some time.
just make a backup and give the settings a try..

Alright, thank you, Deedo.

Cheers for the guide. Not a lot of info online for Deadfall unfortunately since it didn't get a lot of marketing and it lacked super high production values that some people must have in order to enjoy a game, sadly missing out on some great experiences with lesser known titles like DF: Adventures.

In case someone stumbles upon this thread - I found even more tweaks here - http://www.nfohump.com/forum/viewtopic.php?p=2353740

C:\Users\*USERNAME*\Documents\My Games\Deadfall Adventures\ADVGame\Config

MaxProcBuildingLODColorTextureSize=2048
MaxProcBuildingLODLightingTextureSize=1024
(Higher LOD textures, won't make a difference unless there actually is high resolution textures to use, otherwise they will just be the standard res of 1024 and 256 respectively.)

ImageReflectionTextureSize=2048
(Higher resolution reflections, 1024 is a pretty good default though.)

MipFadeInSpeed0=0.01
MipFadeOutSpeed0=0.01
MipFadeInSpeed1=0.01
MipFadeOutSpeed1=0.01
(Try to speed up MipMap streaming, you can also try making it instant by setting the values to 0)

bSmoothFrameRate=False
(I don't like the behavior but it has a use if you want the game to feel smoother.)

MinDesiredFrameRate=15.000000
(This is a old UE2 setting that I just change for the hell of it, does nothing.)

AllowJoystickInput=0
(I don't use a gamepad or joystick but others who do might want to leave this alone.)

MaxChannels=64
(For both the audio systems, soundcard can handle 128 so I keep a nice middle between the original 32 and that.)

PoolSize=512
(Instead of just 160 MB, helps with Streaming but uses more VRAM, you could try 1024 as well but you need a 2.5 GB GPU or higher in my opinion.)

bUseMaxQualityMode=False
(Enforces highest possible settings, I always leave this alone since it tends to bug out self-shadowing thus turning parts of the game pitch black due to the engine trying to use a system there's no shaders or data for so leave it alone.)

CompositeDynamicLights=False
(Didn't need to alter this but otherwise it uses a lower quality system for dynamic lights although you likely need a direct comparison to spot the difference.)

AllowD3D11=True
(Enables DX11, normally if the game does not support - missing code or shader cache files - it it'll just crash but it works here.)

ParticleLODBias=-1
(Enforce highest quality particle LOD bias, messes with the in-game options though so they will report V.Low if you change this.)

MaxDrawDistanceScale=2.000000
(Improved draw distance, I forgot what exactly this affected so you might want to leave it at 1.0 for balance between framerate and visual quality.)

ShadowFilterQualityBias=-1
(Highest quality shadow bias, same as the particle LOD bias above.)

MaxMultisamples=2
(This game actually supports UE3 DX9 MSAA but set this to 9 for some reason so I changed it, should work better under DX11 too but it could cost a bit more performance.)

MinShadowResolution=16
MinPreShadowResolution=16
MaxShadowResolution=4096
MaxWholeSceneDominantShadowResolution=4096
ShadowFadeResolution=1
PreShadowFadeResolution=1
(Increase shadow resolution quality, this will affect performance though so 2048 might be better on balance between that and visual quality.)

ShadowTexelsPerPixel=4.000000
PreShadowResolutionFactor=1.000000
(Further tweaks to shadow quality, didn't have to set the first one which affects smoothness but the factor had a default of 0.5 so I upped it to full.)

Credit: JBeckman

After few levels I started to experiment with settings because I was sick of stuttering. Low, medium, high, very high details. Nothing worked. But then I have changed one last option, ONE! Anti-freaking-aliasing. It wasn't set too high (4X). Every game I play it's enough to work without problems. Since the moment I lowered it to 2X my game works on constant 60 FPS on very high details (I only left textures on high).

Is there a way to enable the unreal engine's split screen function?