Hey guys, I've had this issue for the past few days,it came outta no where and has crippled my flying. The sim in full screen mode runs extremely slow like 8-17 FPS but in windowed mode it runs fine and normal around 60-100fps. I've deleted FSX.CFG and let a new one be created and it solved it for awhile but now its back.  I'm having no other issues with my computer and games like GTA V are running at 60FPS on very high settings.

My specs

Intel [email protected]

MSI GTX980 4GB

8GB Gskill ram

2 1TB HDD's

Windows 7 64 bit.

 

My current .CFG

[bufferPools]

BP=0

RejectThreshold=131072

[VirtualCopilot]

VirtualCopilotActive=1

[sOUND]

AmbientUI=1

AmbientUIMusicVolume=-6.000000

PrimaryDevice={00000000-0000-0000-0000-000000000000}

SOUND=1

SOUND_LOD=1

SOUND_QUALITY=2

UISound=1

VoiceDevice={00000000-0000-0000-0000-000000000000}

[slewTextInfo.1]

AirSpeed=1,5

Altitude=1,3

Heading=1,4

Latitude=1,1

Longitude=1,2

[AContain]

LabelColor=FFFF0000

LabelDelay=1000

ShowLabelAirline=0

ShowLabelAirlineAndFlightNumber=0

ShowLabelAirspeed=0

ShowLabelAltitude=0

ShowLabelContainerId=0

ShowLabelDistance=0

ShowLabelFlightPlan=0

ShowLabelHeading=0

ShowLabelManufacturer=0

ShowLabelModel=0

ShowLabelTailNumber=0

ShowLabels=0

ShowUserLabel=0

[ATC]

AutoOpenAirTrafficWindow=1

COMM_MSG_AI_ATC_COLOR=FFFF7840

COMM_MSG_ATC_AI_COLOR=FF00FF00

COMM_MSG_ATC_USER_COLOR=FFB6FFB6

COMM_MSG_NONE_COLOR=FFFFFFFF

COMM_MSG_USER_ATC_COLOR=FFFFD21B

PilotVoice=0

ShowATCText=1

UsePilotVoice=1

[TextInfo.1]

AirSpeed=1,5

Altitude=1,3

Heading=1,4

Latitude=1,1

Longitude=1,2

WindDirectionAndSpeed=1,6

[AccelerationPack]

ControlsFirstRun=0

HomePageFirstRun=0

[iNTERNATIONAL]

ASLAT=2

ASLON=1

MEASURE=0

[CONTROLS]

Controls_Current=Standard

Controls_Default=Standard

KBDAIL=64

KBDELEV=64

KBDRUD=64

[FACILITIES]

CITY=

COUNTRY=

GTL_BUTTON=1232

STATE=

[TextInfo.3]

AirSpeed=1,5

Altitude=1,3

FrameRate=2,1

FuelPercentage=2,4

GForce=2,3

Heading=1,4

Latitude=1,1

LockedFrameRate=2,2

Longitude=1,2

WindDirectionAndSpeed=1,6

[PointOfInterestSystem]

CycleSetting=0

[GRAPHICS]

AC_SELF_SHADOW=0

AIRCRAFT_REFLECTIONS=1

AIRCRAFT_SHADOWS=0

ALLOW_SHADER_30=1

COCKPIT_HIGH_LOD=1

D3D10=1

EFFECTS_QUALITY=0

GROUND_SHADOWS=0

HIGHMEMFIX=1

IMAGE_QUALITY=0

LANDING_LIGHTS=1

NUM_LIGHTS=8

See_Self=1

TEXTURE_MAX_LOAD=4096

TEXTURE_QUALITY=3

Text_Scroll=1

SHADER_CACHE_PRIMED_10=1693500672

SHADER_CACHE_PRIMED=1693500672

MultiSamplesPerPixel=8

MultiSampleQuality=8

[TrafficManager]

AIRPORT_SCENERY_DENSITY=0

AirlineDensity=20

FreewayDensity=0

GADensity=0

IFROnly=0

LeisureBoatsDensity=0

ShipsAndFerriesDensity=0

[DynamicHeadMovement]

HeadMoveTimeConstant=1.000000

LonAccelOnHeadLon=-0.020000

LonAccelOnHeadPitch=-0.010000

MaxHeadAngle=5.000000

MaxHeadOffset=0.300000

RollAccelOnHeadLat=0.010000

RollAccelOnHeadRoll=0.100000

YawAccelOnHeadLat=-0.100000

[REALISM]

AllowEngineDamage=False

AutoCoord=False

AutoTrim=False

CrashDetection=False

CrashTolerance=0.000000

CrashWithDyn=False

GEffect=False

General=0.000000

GyroDrift=False

GyroEffect=0.000000

ManualLights=False

PFactor=0.000000

RealMixture=False

StressDamage=False

Torque=0.000000

TrueAirspeed=False

UnlimitedFuel=True

[Weather]

AdjustForMagVarInDialog=1

CLOUD_COVERAGE_DENSITY=8

CLOUD_DRAW_DISTANCE=3

DETAILED_CLOUDS=1

DisableTurbulence=0

DownloadWindsAloft=0

DynamicWeather=2

MaxGustRampSpeed=200

MaxGustTime=500

MaxVarRampSpeed=75

MaxVarTime=50

MinGustRampSpeed=1

MinGustTime=10

MinVarRampSpeed=10

MinVarTime=5

THERMAL_VISUALS=0

TurbulenceScale=1.000000

WeatherGraphDataInDialog=0

WeatherServerAddress=fs2k.zone.com

WeatherServerPort=80

WindshieldPrecipitationEffects=1

[Misc]

Com_Rate=7

[Main]

FIBER_FRAME_TIME_FRACTION=0.1

HideMenuFullscreen=1

HideMenuNormal=0

SimObjectPaths.0=SimObjects\Airplanes

SimObjectPaths.1=SimObjects\Rotorcraft

SimObjectPaths.2=SimObjects\GroundVehicles

SimObjectPaths.3=SimObjects\Boats

SimObjectPaths.4=SimObjects\Animals

SimObjectPaths.5=SimObjects\Misc

SimObjectPaths.6=MyTraffic\aircraft

User Objects=Airplane, Helicopter

ProcSpeed=10359

PerfBucket=7

Maximized=1

Location=440,151,1480,929,\\.\DISPLAY1

[Trusted]

C:\Program Files (x86)\GoFlight\GFDevFSX.exe.cbcuaiceorqkuahkqboclwbqnwlurbinkucbiate=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\Aerosoft\Flight Recorder\AS-FlightRecorder.dll.taknrhalwhaqnllotctoeqhnalqoiununhzaccnn=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\Captain_Sim\707\cs.sound.dll.kitzcwiekbbbzblncotaittbcwwaooqtqzbqlcaq=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\Captain_Sim\737\cs.sound.dll.hhkehruoltahcwihrqnzhzkzzurwrilckkrqiloh=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\Captain_Sim\767\cs.sound.dll.kitzcwiekbbbzblncotaittbcwwaooqtqzbqlcaq=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\Captain_Sim\Captain_Sim.b767.menu.dll.htrbluzrqlaeabbbcbztqtciozuubalriqhhorit=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\MD80.dll.qtttbqeltcaeurouwkltcnwonccbueztnwniauil=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\Modules\FSUIPC4.dll.aololikznkzcrraiqqblrwitlkoatzozuocaloib=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\Modules\iFly744.dll.zwecbzhbbbtblhtzokteckhzaqrlclihaeboakar=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\ORBX\FTX_NA\FTX_AA_KJAC\Scenery\ObjectFlow_KJAC.dll.urqtawhiboneqrillbiiouhwkqrqknkihhilcrnl=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\ORBX\FTX_NA\FTX_AA_KMRY\scenery\ObjectFlow_KMRY.dll.azelukhklqewbubiqlqwtticezzblerhkbhqwhtz=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\ORBX\FTX_NA\FTX_AA_KWYS\Scenery\ObjectFlow_KWYS.dll.azelukhklqewbubiqlqwtticezzblerhkbhqwhtz=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\PMDG\DLLs\PMDG_HUD_interface.dll.rwootqliariukitaknkwhwhqawzawonlcnooiiiu=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\PMDG\DLLs\PMDG_Interface.dll.znhkhiornhachrqctrlzqzlrrkiointriblbwaut=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\RAASPRO\RAASPRO.dll.chbnohwuuzzhhchqqquklkuzbrktbcztbeqctqnw=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\VistaMare\ViMaCoreX.dll.kntknrcznwtarcatlqwuahnzwalbtciionwunooa=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\bglmanx.dll.kebrcbwbrrhoccqetqlkocziwbukiqkboququkea=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\fsdreamteam\couatl\couatl.exe.ubhtahhbzbonlukuwbblahtuuebhlrtzeahnzcrq=1

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\GAUGES\CLS_FSX_CONFIG.DLL.bclataiehzticcziablburrllanzkcolcwwhkirk=2

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\GAUGES\CLS_FSX_SOUND.DLL.hnnulukuurkrwqhrzhlrqrinklonqbabchbklobh=2

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\GAUGES\CLS_FSX_FUELDUMP.DLL.wouutknhbzniqlubzorcuwitncclkubzrwnunzoo=2

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\GAUGES\CLS_FSX_TCAS.DLL.ibatwnhktlkhwbcrcewoccbwqrlqncnwtrtrnial=2

C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\GAUGES\CLS_FSX_SOUND_DC10.GAU.zzlqbrqcuutzzzhaohecuaqbiawhizrtqebcnowc=2

[TextInfo.2]

FrameRate=1,1

FuelPercentage=1,4

GForce=1,3

LockedFrameRate=1,2

[uSERINTERFACE]

Map_Orientation=2

PAUSE_ON_LOST_FOCUS=1

PROMPT_ON_EXIT=1

PageID=1

SHOW_MISSION_CAPTIONS=0

SITUATION=FLIGHTS\OTHER\FLTSIM

ShowAllACPaintSchemes=1

SelectAircraftManufacturer=All

SelectAircraftPublisher=All

SelectAircraftType=All

OpenATCOnCreate=0

DisplayFuelAsWeight=0

[sIM]

SYSCLOCK=1

[Display]

ForceVCShadowMap=1

ActiveWindowTitleBackGroundColor=0,28,140,64

ActiveWindowTitleTextColor=255,255,255

BLOOM_EFFECTS=0

ChangeTime=4.000000

InfoBrakesEnable=False

InfoLowerLeftBackGroundColor=255,0,0,128

InfoLowerLeftTextColor=255,255,255

InfoLowerRightBackGroundColor=255,0,0,128

InfoLowerRightTextColor=255,255,255

InfoOverspeedEnable=False

InfoParkingBrakesEnable=True

InfoPauseEnable=True

InfoSlewEnable=True

InfoStallEnable=False

InfoUpperRightBackGroundColor=0,0,0,0

InfoUpperRightTextColor=255,0,0

NonActiveWindowTitleBackGroundColor=24,33,87,64

NonActiveWindowTitleTextColor=255,255,255

SKINNED_ANIMATIONS=1

TEXTURE_BANDWIDTH_MULT=40

TextureMaxLoad=12

TransitionTime=4.000000

UPPER_FRAMERATE_LIMIT=0

WideViewAspect=False

[JOBSCHEDULER]

AffinityMask=224

[slewTextInfo.3]

AirSpeed=1,5

Altitude=1,3

FrameRate=2,1

Heading=1,4

Latitude=1,1

LockedFrameRate=2,2

Longitude=1,2

[PANELS]

IMAGE_QUALITY=1

PANEL_MASKING=1

PANEL_OPACITY=100

PANEL_STRETCHING=1

QUICKTIPS=0

UNITS_OF_MEASURE=0

DEFAULT_VIEW=0

[sTARTUP]

DEMO=0

LoadWindow=1

SHOW_OPENING_SCREEN=1

STARTUP_DEMO=0

[slewTextInfo.2]

FrameRate=1,1

LockedFrameRate=1,2

[TERRAIN]

AUTOGEN_DENSITY=3

DETAIL_TEXTURE=1

LOD_RADIUS=4.500000

MESH_COMPLEXITY=100

MESH_RESOLUTION=25

SWAP_WAIT_TIMEOUT=2

TEXTURE_RESOLUTION=29

WATER_EFFECTS=4

[sCENERY]

DAWN_DUSK_SMOOTHING=1

IMAGE_COMPLEXITY=4

LENSFLARE=0

MAX_ASYNC_BATCHING_JOBS=3

SmallPartRejectRadius=4.0

[DISPLAY.Device.NVIDIA GeForce GTX 980.0.0]

Mode=1920x1080x32

Anisotropic=1

AntiAlias=1

[MULTIPLAYER]

condAccoutPassword=0

 

The video of the issue.

 

Lock your frames to say 31 and see what that does.

Are you using Nvidia Inspector?

There's a few item in you cfg that are different than my setup. 

I run locked 31 and I get great frames.