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DCS World - Strange FPS drop over trees/low to ground...HIGH SPEC SYSTEM


PAWS
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Didn't realize you had mirror on. Tried without mirrors? Maybe grass?

Turning MSAA or SSAA on or off having impact means you are hitting the limits of your resources.

 

Fact is that you are using some heavy graphic settings even tho your resolution is not that high. I'm not familiar with the Spudknocker but I do not agree with some of his advices. SSAA especially costs a lot more than MSAA. +20fps on my system at 1080p.

 

AA and shadows are biggest fps hitters in DCS. And you're running fairly high on those.

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Didn't realize you had mirror on. Tried without mirrors? Maybe grass?

Turning MSAA or SSAA on or off having impact means you are hitting the limits of your resources.

 

Fact is that you are using some heavy graphic settings even tho your resolution is not that high. I'm not familiar with the Spudknocker but I do not agree with some of his advices. SSAA especially costs a lot more than MSAA. +20fps on my system at 1080p.

 

AA and shadows are biggest fps hitters in DCS. And you're running fairly high on those.

 

And thus my point @Taz1004!...

It is that reason alone (using 1920x1080p @60fps vsync LOCKED) and yet still having performance issues like this!...it's absurd and thoroughly frustrating :mad:

 

I have tried alternating every setting available; the grass has no impact whatsoever as far as my tests have gone, whether i have it maximum or at the lowest...

Same goes with mirrors (strangely) - I turn them off or on at the exact moment and again, has no impact.

 

My conclusions are pointing towards some optimisation with the AA options...

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It is that reason alone (using 1920x1080p @60fps vsync LOCKED) and yet still having performance issues like this!...it's absurd and thoroughly frustrating

 

I meant AA and shadow settings put more burden on your system than resolution.

 

I get better fps with 4K resolution with no SSAA than 1080P with SSAA.

MSAA and SSAA together like the video... I never seen anyone recommending that.

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I meant AA and shadow settings put more burden on your system than resolution.

 

I get better fps with 4K resolution with no SSAA than 1080P with SSAA.

MSAA and SSAA together like the video... I never seen anyone recommending that.

 

Well, as i had mentioned to another person on YouTube; the problem with me is the resolution i have tbh...

This Grim Reaper member (nice guy), told me his resolution; something like 5120x(something)...sorry i can't remember!

 

Anyway, he mentioned he doesn't use MSAA or SSAA; however because of the resolution he has, those settings aren't required as much as the higher the resolution, the less 'jaggies' and visual fidelity is far far less affected.

 

The problem i have though isn't just the monitor; because in theory, my performance shouldn't have issues like it has at such a lower resolution anyway (coupled with vsync @60fps).

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Right guys!...i may have stumbled upon a solution (for the time being)

 

As you can see from the screenshots attached, i added SSAAx2 and lowered the shadows to 'medium'.

Firstly, i didn't really want to reduce shadow quality...HOWEVER...

From the results, it clearly shows a huge increase in performance; in fact, while i was flying, the only fps drops incurred were negligible...

 

FPS drops were at most were 4fps, which given the settings 'increase' somewhat, was for the time being acceptable. Let's face it, these tests i'm doing are a bit on the extreme side as i very much doubt i'm going to be flying at those heights and, as i've mentioned before, the higher i go the fps drops don't occur.

 

So, in essence, i lowered the shadows to medium; set the SSAA to x2, and lastly set 'trees visibility' to 80 on the slider. Not perfect by any means and i may do some more tinkering later ;)...but as it stands, i will leave it at those settings.

 

I actually didn't see any significant change between 'high' as apposed to 'medium' shadow setting - again negligible.

 

Screens:

screenA.thumb.png.975a08a3d2f1037513d4eaf64924802a.png

screenB.thumb.png.1c6a912028b98a656f3d8285937a4633.png

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Right...i'll be offline for a few hours; business to attend to...

 

Just want to thank everyone for their input and suggestions; they certainly made the direction to travel more clear ;) THX GUYS!.

 

Like i said though, i'll be looking at improving more but until then, i'll see how these settings go for a day or so.

 

Thanks again guys and by all means, if you come across any further possible settings change that might improve the visual side, then please comment!

 

All the best for a while...

See ya soon!

 

Roger!

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  • 2 weeks later...

Hello again everyone!,

 

Sorry for the delay, but had other things to take care of ;).

Anyway, I wanted to ask something else...

 

In DCS specifically, why is it my gfx card fans spool up to quite a high rate? - I have an Nvidia RTX 2080 Super, i9 10900 and 3gb ram (@3200mhz)!...?

Secondly, DCS has blatantly stated misleading information in the product page; stating that 'perfomance' is great...yeah okay then! *roll eyes*

 

It's not been a good start; I've not even purchased any modules/terrains as of yet and I've been met with performance issues right from the get go!.WTH

 

What annoys me is, I've been told you countless times that, "you shouldn't be having any performance issues with your rig!" - right okay...so how can I resolve them when quite clearly it's nothing to do with my PC.

I have no issues whatsoever in any other title I run; moreover, I know it's the optimization of DCS at fault as some settings have higher impacts...but nonetheless, with my system specs you'd think it would be buttery smooth!.

 

Like I've said before, it's only when flying extremely low(ish) where the frame rate is just absolutely disgraceful.

(500ft plus is when the fps issues reduce)

 

I am just so frustrated with the performance on my rig specifically...:(

 

And please...any ideas how to stop my gfx fans spinning high with nothing going on in the scene would help.

It's like sync isn't working or something???

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Right...thanks a lot! I'll have a look and see if I can get anywhere ;)

So I'm not the only one with the crazy fans!!! Lol

 

Why is it that options are better used in Nvidia than the DCS settings itself...? - the mind boggles!

 

Anyway, when I get the chance later on, I'll have another tinker; I have to stop messing with the settings after a while as I'm near entering insanity! Lol.

 

I have wondered whether it may be just the free Caucasus map and aircraft unoptimized...

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I posted my setting here: https://forums.eagle.ru/showthread.php?t=287196

 

 

You should be using NVIDIA for Anisotropic filtering and VSYNC. Turn those off in DCS. And my 1080Ti howls like a banshee. I leave the sides off the case now. Give it a spray with compressed air now and again. Any little dust slows down the blades. :)

 

I've just viewed your settings and something isn't right here...

You say you have a 1080ti...?

 

Now forgive me but...

Try using the SU-25 on the Caucasus map with those settings; ly over trees very low (About 10-20ft above the tree tops and in doing so, look directly towards the ground from the side doing a 50-80 banked turn...

 

My fps, with my system, drops from 60fps (vsync) to 30fps!

It's nothing to to with my system specs, something (mostly shadows/SSAA/MSAA/heatblur)...those must be having a profound affect...god only knows why!

 

FYI - My system is brand new...less than a week old and has no dust whatsoever...so it's not overheating at all. Even the temps are low on everything!. I don't have page filing on either


Edited by PAWS
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Can you confirm your monitor can do 60hz? I have an Asus PB287Q 4k monitor that was plugged in with HDMI. Turned out it could only do 60hz with a Displayport cable, so I was only getting 30hz. I swapped it with my Dell U2415, and I get a solid 60hz.

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Can you confirm your monitor can do 60hz? I have an Asus PB287Q 4k monitor that was plugged in with HDMI. Turned out it could only do 60hz with a Displayport cable, so I was only getting 30hz. I swapped it with my Dell U2415, and I get a solid 60hz.

 

Hey glide!,

 

Yes absolutely!, my monitor is HDMI using an expensive HDMI cable. The monitor is 75hz capable but, as I am using an HDMI cable, the max it allows is 60hz - hence 60fps (vsync).

 

My resolution is at 1920x1080p.

 

EDIT: I will add that obviously the monitor used for DCS is used for every other simulation/game, and I have no problem whatsoever maintaining 60fps with any other title...rock solid! (And without the GFX card fans spinning at high rpm as in DCS!)


Edited by PAWS
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Whenever I fly over large areas of trees (specifically), and in a 45 - 80 degree banked turn, if I use the numpad to look towards the ground (trees), the fps has drops to around 38fps/45fps or in the low 50s...? why?

 

 

When you bank over any area with a lot of geometry (trees, buildings) you really put the graphics to test. Nvidia Anisotropic is a little better than the DCS version, IMHO. Normally, they recommend going with the application version, but I tested both. Anisotropic filtering helps with near and far sharpness, and our cards can take that workload off DCS nicely.


Edited by glide
typo
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Like I have stated, the frame rate drops ONLY occur if I have either shadows on HIGH; specifically with either MSAA OR SSAA enabled.

 

And once again, once above say 700-800ft, with those settings enabled, the fps issues dissipate.; the higher I go the less the fps drops.

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I ran DCS back when it was on disk, and then took 20 years away from the HOTAS doing life stuff. Just getting back to it. The thing to keep in mind is the human eye can only detect 25 fps, and 30 fps is considered full motion video. So 60 fps is more than enough if its stable.

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Well, when you get a chance, follow my instructions precisely, and report back. Cheers!

 

I certainly will @glide...I'll get back to you on this soon ;)

 

I do really appreciate your help and support, and I am optimistic that I'll figure it out...maybe it'll be a trade-off for something but, as a whole, my goal is to get the highest fps without visual fidelity sacrifice.

 

Talk soon!

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You'll notice that even in just the main menu DCS is using 100% of the GPU. That's why you get the fans spinning so hard.

 

That's been a long time annoyance tbh. Menus need some internal limits, they run at full-speed something, probably FPS, I can't recall now. Same for Pause I think.

1st.: PC Specs: Win10P 2004 (20H1), 1440p@75"32 - MB: Asus ROG Strix X-570E - CPU: AMD Ryzen 5 PRO 4650G - GPU: AMD Radeon RX480 - RAM: 64 GB - SSD: Samsung 970 EVO Plus 1TB NVMe

2nd.: PC Specs: Win10P 2004 (20H1), 1440p@75"32 - MB: Asus P9X79 - CPU: Intel i7 3820 - RAM: 32GB - GPU: AMD Radeon RX480 8GB - SSD Samsung 870 EVO 250GB (DCS), Input: Saitek Cyborg X/FLY5

Modules: A-10C I/II, F/A-18C, Mig-21Bis, M-2000C, AJS-37, Spitfire LF Mk. IX, P-47, FC3, SC, CA, WW2AP, CE2.

Terrains: NTTR, Normandy, Persian Gulf, Syria.

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