framerate is playing pong on me

Mac Technical Support
Specs:

Model Name: MacBook Pro
Model Identifier: MacBookPro5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.53 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 6 MB
Memory: 4 GB
Bus Speed: 1.07 GHz

I have a 9600M GT and 9400M. I am playing on the 9600M GT and I have configured my settings so I should be getting a smooth 30-40fps constantly. It is "fine" if I stay in one spot and not move the camera. By "fine" i mean that instead of constantly bouncing between 5 and 50fps it bounces between 20-35. By this I mean it will go up to ~40 then drop down to about 5-10 then bounce back up to 40. This is completely regular and no introduction of more effects or activity seems to change this.

I have the latest graphics update installed, and turning the settings down does not seem to change the fact it still does this. Is there some setting I am missing that fixes this? I am running natively at 1440x900 and don't want to change that unless it is the only way I can make this playable.

Any suggestions or recommendations as to how to fix my frame rate issues?
Same problem here....Complete inconsistent framerates. The update DID help however. Instead of the framerates dropping to 5 when I clicked on a pylon they stay above 25 when I am on medium settings.

THe fremrates are still all over the place and teh performacnce still lacks cmpared to windows...sigh
OK, thanks to another forum member I was able to get a great start with making a config that runs pretty smooth.

Below is my Variables.txt file. This will run at about 20fps on a late 2008 MBP using the 9600M GT. I have 4GB of ram and a 2.53Ghz processor, so if you have less than that you will need to expect performance to be lower. I have it setup so my textures are on high, if you bump that back to medium then it will run at about 30-40fps. For the most part it seems to have eliminated the bouncing frame-rate, you can still expect some but very rarely.

alphadepthWrite=1
aolight=0
creepnormalmap=1
creepQuality=1
creepreflection=0
creepselfshadow=0
creeptrans=1
deff=0
deffspec=0
depthDisp=0
displayflyerhelper=None
displaymode=2
displayunitstatus=None
dof=0
dragscrollspeed=1
fogvolume=0
foliagedensity=0.250000
foliagequality=1
frameratecap=60
frameratecapGlue=40
gamehdr8bit=1
gamma=1.092000
GraphicsOptionEffectsDetail=1
GraphicsOptionLightingQuality=0
GraphicsOptionModelQuality=2
GraphicsOptionMovies=3
GraphicsOptionOverallQualityVer7[5]=4
GraphicsOptionPhysicsQuality=0
GraphicsOptionPortraits=2
GraphicsOptionPostProcessing=0
GraphicsOptionReflections=0
GraphicsOptionShaderDetail=1
GraphicsOptionShadowQuality=1
GraphicsOptionTerrainQuality=1
GraphicsOptionTextureQuality[2]=2
halo=0
hdr=1
hdr8bit=1
height=900
hotkeyprofile=2_GridLeftSide
LastChallengeId=ZergInfestation
lastDeviceId=2147
lightingLevel=0
lightmap=1
lightmapcastshadows=0
localao=0
localeidassets=enUS
localeiddata=enUS
localight=0
localShadows=0
lowqualitymodels=0
lowQualityMovies=0
mousescrollenabled=1
mousescrollspeed=30
mousesensitivity=0.500000
mousewheelzoomenabled=1
MoviesSeen=1
music=1
MusicHeard=1
normalmap=1
parallax=0
parallaxshadow=0
particlelod=1
particleobjects=0.000000
particleterrain=0.000000
physicsdensity=0
pixellight=1
portraits3d=1
preBlendedCreep=0
preferWindowedFullscreen=0
profanityfilter=1
reducemouselagenabled=0
ribbonlod=1
sampleFOW=0
shadowmapsize=2048
shadows=0
simplifiedCloaking=0
simplifiedShaders=0
soft=0
softshadows=0
softshadowTaps=6
SoundAutoDetectCPUCoreCount=2
soundchannels=32
soundoutput=Default
SoundQuality=1
spec=1
splatlod=1
systemutilitykeysdisabled=1
targettexeldensity=1.400000
TerrainTextureHiResCacheSize=8
TerrainTextureLowResCacheSize=50
TerrainTextureSize=768
texQualityLevel=2
texSpace[2]=640
textureBasedFOW=1
transparentshadows=0
treadlod=1
useLowqualitymodels=0
voicechatmode=1
voicechatsoftwaremute=0
vsync=0
watercaustics=0
waterflipbook=1
waterreflection=0
waterrendertargetformat=1
waterrendertargetsize=768
watershadow=0
width=1440
windowheight=819
windowx=121
windowy=63

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