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I use FPS locked in P3D (26) and the FIBER_FRAME_TIME_FRACTION=0.01 (that's not up for debate that's just what works for me )

But I thought I would try after people keep saying its best to use an external one.

 

Well, firstly is there any technical reason why? I would like to fully understand why an external limiter is better than locked/FFTF 0.01.

I Downloaded RTSS and removed FFTF (set FPS to unlimited within P3D) to try it but I ran into a problem right away. I run two screens one above the other, the top screen is for P3D and I use the bottom screen to drag 2D pop-ups of the PFD/ND to use at there IRL full-size.

The problem is the second I open a 2D pop-up ND/PFD FPS drop from 26 to 13...half! is there a way in RTSS to stop this?

Any other suggestions to get the best out of RTSS if I can get around it halfing my FPS with pop up's.

 

 

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What method are you using? manual FPS value or 1/2 scanline sync? If its scanline sync, just out of curiosity, what happens when you set your MFD refresh rate (within the sim) to double the target FPS? (so 60 if you are targeting 30FPS). 

 

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All I did was set 26 FPS in the little window but within FSL 2D FPS are set to 13, but the sim itself was also running at 13 FPS once the 2D was open.

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Posted (edited)

RTSS @ VSync/2 will help smooth the frame rates so that they match the (half) sync rate of the monitor e.g.  a 60Hz screen mode @ a half vsync rate will yield 30 fps and should be quite smooth becuase the output is vsync'd, providing the PC can reach 30 fps and have some headroom (20% is a reasonable figure, but higher is better).

This vid link includes the RTSS and P3D settings used to achive the vid fps rate.

Riva Tuner Statistics Server vsyncing @ half monitor 60hz for 30 fps @ L35 Big Bear airport

Check the bottom RH corner where the framerate counter displays.

As to dropping fps when opening another window, yes that happens and maybe someone else with more knowledge in that area can help perhaps?

Cheers

Edited by Rogen

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I too get the frame rate drop when opening 2d panels and dragging to another screen.  I am trying to adjust to opening and closing the panels on the same screen.  It is too bad because RTSS vync/2 seems to smooth things for me.

 

Darcy

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Seams its a no go then. 

Might try Nvidia inspector to just lock fps and see if that works?

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You're mising the point of VSync which is to align the application's screen output with the actual monitor screen mode draw scanrate.

Throw is a bit of buffering (Triple Buffer) to help keep alignment and the result is a very smooth and stutter free flying experience.

Since practically no machine can reliably output 60~80 fps once a bunch of addins have been installed, a half vsync option (such as provided by RTSS) or a 30 Hz monitor and the use of the P3D vsync settings, will provide a very smooth flying experience while also typically leaving enough GPU headroom to increase the P3D graphics sliders.

The caveate though is that the machine must be able to maintain enough fps to sit in the VSync sweet spot, e.g. ~29 to 31 fps for a 30 Hz screen mode.

So in reality, and because the P3D frame rate is not static, the machine will need to produce an overhead of fps, around 10~30% is a reasonable figure.

If the machine can consiistantly maintain such rates you'll find vsync a quite an enjoyable flying experience.

But given you're talking 26 fps...

Cheers

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Posted (edited)

I get what your suggest but your “missing the point” I don’t run VS or 30 FPS. If I was looking for how to run Vsync and Triple B, I would of asked.

Thank you for your thoughts, but all I want was to lock FPS at 26 without the loss with 2D,s open.

I have no problems with smoothness or textures loading.

 

Edited by Nyxx

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Posted (edited)

Faster computer?

More GPUs with one to run a screen separately?

Do you have a spare GFX card that can be trialed to drive a second monitor?

Here's an advanced P3D sim, last pic take a look at the size of the computer running it all.

http://aviationphotodigest.com/raaf-the-next-generation

Cheers

Edited by Rogen

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Posted (edited)
7 hours ago, Nyxx said:

I get what your suggest but your “missing the point” I don’t run VS or 30 FPS. If I was looking for how to run Vsync and Triple B, I would of asked.

Thank you for your thoughts, but all I want was to lock FPS at 26 without the loss with 2D,s open.

I have no problems with smoothness or textures loading.

 

Last year I tried an external framerate limiter ( NVI )  with a locked framerate and 2 views : I ended up with 50% of the framerate...

Edited by GSalden

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Posted (edited)
3 hours ago, GSalden said:

Last year I tried an external framerate limiter ( NVI )  with a locked framerate and 2 views : I ended up with 50% of the framerate...

Hi Gerard,

OK that’s it, giving up on this idea, thanks for sharing.

Edited by Nyxx

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On 5/19/2019 at 8:07 AM, Nyxx said:

that’s it, giving up on this idea

Don't give up! I use DxTory and it works like a charm. I run a projector for the outside view and 3 screens for all the instruments / displays. You can set whatever fps you like and it will limit the fps to this number without any halving or drop as you get with RTSS. 

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I have tried RTSS with a frame limit of 25 and sync x1/2 . I then set FPS in the sim to 30 with no vsync settings. (Normal 60 hz monitor).

This gives me the best fluidity BUT the frame rate in the sim only shows around 12 fps but it is obviously halving the indicated  FPS as well as the sync rate as turning off RTSS returns it to 25-30 fps.

So in my case, low frame rates are no indication at all of the smoothness of what is presented.

One obviously needs a degree in computer programming to understand all the nuances of these settings!

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Posted (edited)

Try unlimited in p3d,  along side 1/2 sync use value of -1 . Do not enter a value for frame limit in RTSS.

Edited by onebob

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Thanks. 

However my first attempt at those settings is a fail P3D doesn't even open.

Will try again later.

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Posted (edited)
58 minutes ago, IanHarrison said:

Thanks. 

However my first attempt at those settings is a fail P3D doesn't even open.

Will try again later.

I would try a frame limit first.   ( again a setting in P3D of unlimited )

return the scanline sync back to :-     ' Scanline Sync    0 '           ( ie switching scanline off  )

then enter a frame limit :-                   ' Frame Limit       30'           ( a value of 0 switches frame limit off )

Have you added Prepar3D.exe in the pane on the left and clicked on it.

These setting are for a 60Hz monitor

regards  bob

Edited by onebob

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Posted (edited)

Limiting frames, whether in sim, or externally, to something that isn't a multiple of your refresh rate, is going to induce stutters.

If you have a 60hz monitor and aren't limiting it to 30, 20, or 15, then you might as well not use any frame limiting at all.

Even if you can only hit 26fps limiting to 30 will give you a better experience, you'll be getting the same/less stutters but higher average framerates. You'll be getting steady stutters 2-3 times a second by locking to 26.

Edited by itsjase

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That "not loading" was obviously a glitch, as now all is well.

Now have no fps limit in RTSS, 1/2 scanline with -1, and unlimited in P3D, with P3 running as a profile.

Did a torture test. PMDG 747 at EGLL with EF and AS and Orbx TE. On ground Fps varying 13-25, in air 12-20.

As to be expected some minor stutters but overall very acceptable .

Will just try that with limited FPS at 30.

Then I will leave well alone.

Thanks for the assistance.

 

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Posted (edited)
On 5/18/2019 at 11:11 AM, Nyxx said:

The problem is the second I open a 2D pop-up ND/PFD FPS drop from 26 to 13...half! is there a way in RTSS to stop this?

There is a problem when using ext FPS limiter and more then one display. Search for "Undocking panels halves the framerate" or something simmilar. You will find some topics which all ended up to dropping the external FPS limiter ONLY IF YOU PLAN TO UNDOCK PANELS.

I can't recall why it happens and I think there was also some mention towards P3D running windowed or something....just serach for it (Google) and you will find your answer.

EDITED: Look at the last post for a possible fix..: https://prepar3d.com/forum/viewtopic.php?t=119732

Edited by GEKtheReaper
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Posted (edited)
46 minutes ago, IanHarrison said:

1/2 scanline with -1

This value positions the scanline on the monitor, I think it puts it below the bottom or above the top. other values ( 1or higher )work but you may see tearing.

Entering a value of 0 will switch scanline off.

I use this value as it was suggested on the Guru3d forum.

 

regards  bob

Edited by onebob

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