Hi all,I've noticed that I get stutters from fluctuating frame rates in external views but not in cockpit views. I have an i5 2500k overclocked to 4.6 GHz and a GTX 560 Ti. I'm locking frames through nvidia inspector (30 fps). In cockpit views, even in intensive aircraft (e.g. PMDG NGX) frames are pretty stable at roughly 30 fps, but as soon as I go to an external view, even without any panning, it's very stuttery. Frames fluctuate all through the range of 5 to 80 and don't settle down. As soon as I go back to the cockpit it's back to a stable 30 fps, very smooth. Any idea what could be happening? At first I thought the problem was that I was using nvidia inspector to lock frames but I get the same exact result with limiting frames internally in FSX, the antilag limiter, and FPS Limiter 0.2. It seems to me something might have changed in my setup to cause this (I never noticed it before about a month ago) but I didn't realize it was a "thing" rather than a one-off event until recently, so I have no idea what that change might have been.I'm happy to post my fsx.cfg but I don't want to clutter the topic if this is an obvious answer to somebody out there. My bufferpools settings are as follows:[bufferpools]UsePools=1PoolSize=8388608RejectThreshold=131072UsePools=0 creates nasty autogen spikes on my system, although I noticed that there are no stutters in external views. Any help is very welcome!Thanks,James

Try a smaller poolsize.Sorry to be short. On the cellular phone

It's already only 8 meg, Zach... I would certainly play with it, though, but I'd like to see the rest of the setup - his cfg file, and what monitors he's driving..

It's already only 8 meg, Zach... I would certainly play with it, though, but I'd like to see the rest of the setup - his cfg file, and what monitors he's driving..

I see. Sorry, I'm at home on the big screen now. Sure enough!

At work now, but will post my full cfg when I get home. I only have one monitor in my setup.

It's already only 8 meg, Zach... I would certainly play with it, though, but I'd like to see the rest of the setup - his cfg file, and what monitors he's driving..

Ok, here's my fsx.cfg:// This file was tweaked on Oct 28, 2011 at 17:22 GMT using Bojote's automated FSX Tweaking & Tuning Service// Your 'original' fsx.CFG file was backed up at http://www.venetubo.com/fsx/95d5f6103c25a458e4cdd3fe95f8ad2d/backup/fsx_backup.cfg// This file is optimized as follows: 4 core(s), CPU speed 5, HT 0, GPU 4, PREF 2// You can visit Bojote's FSX Tweaking & Tuning service at 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GeForce GTX 560 Ti .0]Mode=1920x1080x32Anisotropic=1[MULTIPLAYER]condAccoutPassword=0VoiceVolume=1.300000

For starters you have 2 DISPLAY.Device.NVIDIA sections

For starters you have 2 DISPLAY.Device.NVIDIA sections

Good catch! Fixed. Sadly, the issue remains...

I've deleted the bulk of the cfg, as it has no impact for this purpose, and have highlighted the lines you need to modify in an attempt to fix the issue: What I've shown are parameters to try - each one alone is not necessarily the cause of the stutters, but will be contributing factors.Red - make these changes..Blue - suggestions to experiment with - may find an impact.

[GRAPHICS]TEXTURE_MAX_LOAD=4096 <--- Killer - make this 1024[TrafficManager]AIRPORT_SCENERY_DENSITY=3AirlineDensity=70 <--- BIG killer - make this 35GADensity=20 <--- When flying airliner - make this zero, when flying small GA - make AD 15.LeisureBoatsDensity=20 <--- 10, topsShipsAndFerriesDensity=20 <--- 10, tops[REALISM][Weather]AdjustForMagVarInDialog=1CLOUD_COVERAGE_DENSITY=8 <--- Roll this one back.CLOUD_DRAW_DISTANCE=8 <--- Roll this one back.[Misc][Main]FIBER_FRAME_TIME_FRACTION=0.18 <--- Add this lineProcSpeed=18209PerfBucket=7[TextInfo.2][uSERINTERFACE][sIM][Display][JOBSCHEDULER][slewTextInfo.3][PANELS][sTARTUP][bufferpools]UsePools=1PoolSize=8388608 <---- try much larger sisze - say, 204800000RejectThreshold=131072 <---- try 524288[slewTextInfo.2][TERRAIN]AUTOGEN_DENSITY=5 <--- BIG Killer - make this 4 or even 3LOD_RADIUS=4.500000 <--- Nice to have if your system can handle the extra load....MESH_COMPLEXITY=100MESH_RESOLUTION=25 <--- Roll this one back.SWAP_WAIT_TIMEOUT=2TEXTURE_RESOLUTION=29 <--- Roll this one back.WATER_EFFECTS=4 <--- Should be '6' when using Shaders v3.0[sCENERY]IMAGE_COMPLEXITY=5 <--- BIG Killer - make this 4 or even 3MAX_ASYNC_BATCHING_JOBS=3//SmallPartRejectRadius=1 <--- delete this line[Trusted][FlightPlanMap][WeatherMap][MAPVIEW_MAP][DISPLAY.Device.NVIDIA GeForce GTX 560 Ti .0]Mode=1920x1080x32Anisotropic=1 <--- Make this 'Trilinear'[MULTIPLAYER]

OK?

I've deleted the bulk of the cfg, as it has no impact for this purpose, and have highlighted the lines you need to modify in an attempt to fix the issue: What I've shown are parameters to try - each one alone is not necessarily the cause of the stutters, but will be contributing factors.Red - make these changes..Blue - suggestions to experiment with - may find an impact.OK?

Let's discuss side effects.You're TEXTURE_MAX_LOAD=4096 setting is fine the way it is. This won't cause stutters. Without it set to 4096, hires textures won't be hires.Adding the FIBER_FRAME_TIME_FRACTION=0.18 can cause more issues. Mainly in the form of blurries. Also, it's been said this line can induce stutters.Water effect 4 is fine to use with Bojote's Mod. I do currently use 6, though.In other words it's obvious we're dealing with the GPU here. I would use the bufferpools=0 tweak you mentioned caused instability, and lower my inspector AA settings. Something like 8xS and whatever supersampling gives you the best mix of quality and performance. When you found you could fix the stutters with bf=0, you also cornered the root cause of your issues.Also, since you are using max autogen (I do too with no ill effect): Your .cfg doesn't have the lines"TERRAIN_MAX_AUTOGEN_TREES_PER_CELL=4500TERRAIN_MAX_AUTOGEN_BUILDINGS_PER_CELL=2500They should be just under the line "Water_effect"

:(

I thought this subject was a normal FSX trait. Can be reduced but will always some stutter, no?

What worked for me was disabling aircraft shadows on itself. I still have shadows in the ground but disabling shadows on the aircraft worked for me Lee

Paul, I know that some of my settings are likely to strain my system (I admit to having sometimes pushed things too far!). The thing is, with these settings I'm getting great performance in the cockpit--except in the most intensive areas (e.g. KJFK, EGLL, etc.) frames are consisently above 20, and often locked and rock-solid at 30, and very smooth with NO stutters at all. That's why I was thinking there might be some isolated setting that for some reason only applies to the external view and that is causing the framerate fluctuation. (I'm actually very curious to see if it stops when I disable aircraft self-shadowing--thanks for the idea, Lee.) Since I spend 95% of my time in the cockpit, this is more of an annoyance than a show-stopper, and if it's a choice between reducing my settings so I get smoother external views or leaving it as is and getting those stutters I'll go the latter route.Why is setting trilinear better than aniso in the cfg? I'm of course doing AF in inspector anyway, but I wasn't sure which cfg setting was better (if any). Also, why is water effects 6 required? Wouldn't that strain performance more?Zach, what's the benefit of adding those autogen lines to the cfg? My understanding is that they're not likely to actually limit much (because, e.g. the max number of buildings possible in a given cell is always lower than that upper limit) and NickN advised against doing it.Unfortunately, my inspector settings are already quite conservative. I use 8xSQ for antialiasing. I guess I could try lowering AA and AF to 0 and see if it makes a difference as far as BP=0 spikes go.Sorry for all the questions--I'm trying to understand the arcane field of cfg tweaking a little better. Thanks to everyone for their insights!Best,James

Ok, more testing needed, but simply removing the entire bufferpools section from the cfg file seems to have almost eliminated the stutters in external views.Meanwhile, testing with bufferpools=0 leads to a probably 10 to 10% increase in FPS but with instability, spikes and other graphical artifacts. The smoothness is nice but the side effects are a dealbreaker.