TKH258's.

Note that those obvious changes are:
-High resolution shadow (1920)
-Less shadow jitterring (1.5)
-Less HDR Bloom & HDR Brightness Level (0.5,0.5)
-No Edge AA (0,increases performance)
-No Post MSAA (0,further increases performance)
-Particles or Decals lasts almost forever (999)
-Ragdoll lasts almost forever except for some scripted cleanup (999)
-Overall textures & sprites look a bit more crisp & detailed (6135)
-All draw distance options are set to (999)
-Arms' are further into the screen making weapons' stock longer (70)...
-Absolutely Non optimised & might reduce performance (More than Crytek's Extreme preset)

All the best!

sys_spec_ObjectDetail=4
sys_spec_Shading=4
sys_spec_VolumetricEffects=4
sys_spec_Shadows=4
sys_spec_Texture=4
sys_spec_Physics=4
sys_spec_PostProcessing=4
sys_spec_Particles=4
sys_spec_Sound=4
sys_spec_Water=4
sys_spec_GameEffects=4
sys_spec_Full=4
sys_spec_Quality=4
g_skipIntro=1
i_mouse_accel=0
i_mouse_accel_max=0
i_mouse_smooth=0
r_TexMaxAnisotropy=16
r_PostMSAAmode=
r_VSync=0
g_enableInitialLoginScreen=0
r_MultiGPU=0
g_useHitSoundFeedback=0
sys_MaxFps=0
sys_preload=1
r_CoronaSizeScale=0.5
r_ShadowBluriness=0
g_joint_breaking=1
ai_AllowAccuracyIncrease=1
ai_AllowAccuracyDecrease=1

;GameEffects:
i_lighteffects = 1
g_corpseMinTime = 999.0
g_corpseUnseenTime = 999
g_corpseMinDistance = 999.0
g_battleDust_enable = 1
mfx_Timeout = 0.01

;ObjectDetail:
e_ObjQuality=4
e_ProcVegetation=1
e_DecalsAllowGameDecals=1
e_DecalsLifeTimeScale=999
e_DecalsOverlapping=1
e_LodRatio=999
e_LodMin=0
e_Lods=0
e_ViewDistRatioDetail=999
e_ViewDistRatioVegetation=999
e_VegetationMinSize=0
e_VegetationBending=1
e_ViewDistRatio=999
e_ViewDistRatioCustom=999
e_ViewDistRatioLights=999
e_ViewDistMin=999
e_MaxViewDistSpecLerp=1
sys_flash_curve_tess_error=2
e_VegetationSpritesDistanceCustomRatioMin=1
e_VegetationSpritesDistanceRatio=1.5
e_TerrainDetailMaterialsViewDistXY=2048
e_TerrainDetailMaterialsViewDistZ=128
es_DebrisLifetimeScale=999
e_OcclusionCullingViewDistRatio = 999
e_Dissolve=2
ca_DrawFaceAttachments=1
ca_AttachmentCullingRation=300
e_TerrainOcclusionCullingMaxDist=999
e_streamCgf=0

;Particles:
e_ParticlesQuality = 4
e_ParticlesMaxScreenFill = 999
e_ParticlesMinDrawPixels = 1
e_ParticlesObjectCollisions = 2
e_ParticlesPoolSize = 8192
e_ParticlesEmitterPoolSize = 4096
r_UseParticlesHalfRes = 0
e_ParticlesForceAnimBlend = 1
e_ParticlesForceGI = 1

;Physics:
e_CullVegActivation=50
g_tree_cut_reuse_dist=0
p_max_MC_iters=6000
e_PhysFoliage=2
es_MaxPhysDist=100
es_MaxPhysDistInvisible=25
e_PhysOceanCell=0.5
e_FoliageWindActivationDist=25
g_breakage_particles_limit=999
p_max_object_splashes=3
p_splash_dist0=7
p_splash_dist1=30
p_splash_force0=10
p_splash_force1=100
p_splash_vel0=4.5
p_splash_vel1=10
v_vehicle_quality=4
p_max_substeps_large_group=5
p_num_bodies_large_group=100
p_gravity_z = -13
p_joint_damage_accum=2
p_joint_damage_accum_threshold=0.2
p_num_threads=2

;PostProcessing:
r_DepthOfField=2
r_MotionBlur=2
r_sunshafts=1
r_UseEdgeAA=0
r_Flares=1
r_Coronas=1
r_colorgrading=2
r_GlowAnamorphicFlares=1
r_RainMaxViewDist_Deferred=999
r_MotionBlurMaxViewDist=999
r_PostMSAA=0
r_PostMSAAEdgeFilterNV=1
r_PostProcessHUD3DCache=0
r_MotionBlurShutterSpeed=0.0055
r_HDRBloomMul=0.5

;Quality:
q_ShaderGeneral=3
q_ShaderMetal=3
q_ShaderGlass=3
q_ShaderVegetation=3
q_ShaderIce=3
q_ShaderTerrain=3
q_ShaderShadow=3
q_ShaderFX=3
q_ShaderPostProcess=3
q_ShaderHDR=3
q_ShaderSky=3
q_Renderer=3

;Shading:
sys_spec_Quality=4
e_SkyType=1
e_SkyUpdateRate=1
r_DetailTextures=1
r_DetailNumLayers=2
r_DetailDistance=8
r_HDRRendering=2
r_SSAO = 3
r_SSAOQuality=3
r_SSAODownscale=0
r_refraction=1
sys_flash_edgeaa=1
e_VegetationUseTerrainColor=1
e_TerrainAo=1
e_TerrainNormalMap=1
e_DynamicLightsMaxEntityLights=999
r_UsePom=1
r_EnvTexUpdateInterval=0.05
r_TexturesFilteringQuality=0
e_ParticlesLights = 1
e_GINumCascades = 1
r_HDRBlueShift=1.0
r_HDRBrightLevel=0.5
r_HDRBrightOffset=15
r_HDRBrightThreshold=20
r_HDRLevel=6
r_HDROffset=10
r_EyeAdaptationBase=0.25
r_EyeAdaptationFactor=0.5
e_GI = 1
e_GIMaxDistance=999
e_GIAmount = 0.6

;Shadows:
e_Shadows = 1
r_ShadowBlur=0
e_ShadowsMaxTexRes=1920
r_ShadowJittering=1.5
e_GsmLodsNum=5
e_GsmRange=3
e_ShadowsCastViewDistRatio=999
r_ShadowsMaskResolution=0
e_GsmCache = 0
e_ShadowsResScale = 3.4

;Sound:
s_MPEGDecoders=32
s_Obstruction=1
s_ObstructionAccuracy=1
s_ObstructionUpdate=0.1
s_SoundMoodsDSP=1
s_VariationLimiter=1.0
s_ReverbType=2

;Texture:
r_TexturesStreaming = 0
r_TexBumpResolution=0
r_TexResolution=0
r_TexSkyResolution=0
r_ImposterRatio=1
r_EnvCMResolution=2
r_EnvTexResolution=3
r_DynTexMaxSize=6135
r_TexAtlasSize=6135
r_DynTexAtlasCloudsMaxSize=6135
r_DynTexAtlasSpritesMaxSize=6135
r_VegetationSpritesTexRes=6135
r_TexMinAnisotropy=16

;VolumetricEffects:
r_Beams=3
r_BeamsDistFactor=0.05
r_BeamsMaxSlices=200
e_Clouds=1
r_CloudsUpdateAlways=1

;Water:
r_WaterReflections=1
r_WaterUpdateFactor=0.0
e_WaterTesselationAmount=10
e_WaterTesselationSwathWidth=10
r_WaterUpdateDistance=0.2
r_WaterReflectionsQuality=4
e_WaterOceanFFT=1
q_ShaderWater=3
r_WaterReflectionsMinVisiblePixelsUpdate = 0.05

;Misc
;s_musicvolume=0.003
;s_sfxvolume=0.008
;s_dialogvolume=0.008
g_blood=1
r_Brightness=0.5
r_Contrast=0.5
r_Gamma=1.25
r_displayinfo=1
g_EnableDevMenuOptions=1
r_DrawNearFoV=70

Already 5 c.p. at A Walk in the Central Park, I'm going into the alien structure. Currently, I have 1000 on X-43 Mike, 8 on M20 14 Gauss, 4 JAW, 4 remote explosives & 5 frag. grenade. Is it enough to proceed?