Вот с такими настройками conf.ini смог более-менее полетать в мультиплеере где-то 8х8, на карте "крест-круг"...
Система: C2D E8400, 2Gb, Ati HD4850, W7x86 SP1

Скрытый текст:
[BOB]
AntiEpilepcy=0

[window]
DepthBits =24
StencilBits=8
DrawIfNotFocused=0
SaveAspect=0
Render=D3D10_0
width=1280
height=800
ColourBits=32
FullScreen=1
ChangeScreenRes=1

[NET]
speed=100000
localPort=27015
serverName=todenis Server
serverDescription=IL-2 Sturmovik: Cliffs of Dover
serverInfo1=
serverInfo2=
serverInfo3=
serverInfo4=
VAC=1
maxPlayers=16
socksEnable=0
socksHost=
socksPort=1080
socksUser=
socksPwd=

[Console]
IP=20001
UseStartLog=1
WRAP=1
PAUSE=1
HISTORY=1024
HISTORYCMD=1024
PAGE=20
LOG=0
LOGTIME=0
LOAD=console.cmd
SAVE=console.cmd
LOGFILE=log.txt
LOGKEEP=0

[rts]
tickLen=30
ProcessAffinityMask=2
maxTimerTicksInRealTick=20
; 0 - not use, 1 - show cursor and not capture, 2 - not show cursor, and capture
mouseUse=2
; 0 - not use, 1 - use if hardware exist
joyUse=1
; 0 - not use, 1 - use if hardware exist
trackIRUse=1
DisableIME=0
culture=en-GB

[rts_mouse]
SensitivityX=1.0
SensitivityY=1.0
SensitivityZ=1.0
Invert=0
SwapButtons = 0

[rts_joystick]
FF=1

[core]
RandSeed = 0
TexQual=3
TexFlags.PolygonStipple=0
Shadows=0
SpecularLight=2
DiffuseLight=2
DynamicalLights=1
MeshDetail=1
LandShading=0
LandDetails=0
Sky=3
Forest=0
VisibilityDistance=3
LandGeom=2
DrawCollisions=1
Water=-1
Effects=1
EffFlags.Light=1
EffFlags.SpriteRender=0
Grass=-1
CordEffect=1
UseFog=0
UseLandCube=1
UseLandConnectedObject=1
LinearObjectManager=1
Roads=-1
Sun=1
Clouds=1
EffFlags.LightSpritesProj=1
ShadowMapSize=5
TexFlags.AsyncLoad=1
TexFlags.ShowTexture=0
SimpleMesh.SWTransform=0
SimpleMesh.QuadTreeClip=1
SimpleMesh.InstancingHW=1
EffFlags.LightContextSprites=1
CloudsFlags.Detailed=1
TexFlags.CreateHDR=1
Decals=2
EffFlags.SWLight=0
TexFlags.CockpitOnePass=0
MegaTexture=0
TexFlags.Reflection=0
RenderTargetQual=3
MSAA=0
MeshStatics=0
MeshStaticsDetail=0
SimpleMesh.QTNoCompose=0
MeshFirstLod=0
MeshShowLod=0
SpawnHumans=0
TexFlags.FastTransparency=1