Hello all,

I am wondering if anyone has encountered losless scaling reducing FPS?

I have RTSS frame rate limited to 15, VSCYNC off and uncapped FPS everywhere else, and Loselss settings of X2, 1/2 Vsync and DXGI.

In P3D, this gives me 30FPS nicely locked to my monitor.

In MSFS, my FPS drop to around 8-10 or so whenever I engage losless scaling.

Is there some trick to it?  As the title says, I have it working with idential settings in P3D with no problems.

Thanks for any advice you can offer!

Cheers,
Rudy

PS specs: i7 6700K @ 4.5, HT off, 1080, 16GB RAM

Edited September 1, 20241 yr by VHOJT

Use MSFS nvidiaprofile to limit fps to 30, 20 or 15.

LLS nvidiaprofile set Vsync ON (not 1/2)

VSync in MSFS=OFF

When you activate the window, you should see 15/30 or 20/40 or 30/60 when scaling is set to x2.

Edited September 1, 20241 yr by Nemo

11 hours ago, VHOJT said:

I have RTSS frame rate limited to 15,

Curious as to why you have set RTSS to limit the frames to 15.

I believe the recommended limit is half of what your monitor refresh rate is capable of. For example, 100kHz refresh -> RTSS set to 50.

I have VSync enabled and frames limited to 50% of the monitor refresh rate (which is 60 Hz on my desktop PC) on my sim's graphics settings. Usually, this gives me a nice and fluid experience in the sim.

With Lossless Scaling enabled, I can get consistent 60 FPS in almost every flight scenario, almost doubling my default sim FPS. Don't see any reason why Lossless Scaling could be limiting or lowering the FPS. 

Here's a pretty good video that goes through it, step by step:

 

Might be VRAM usage? perhaps check how that looks

Notice that his gpu is a 1080. That is why is locking fps at 15 instead of say 30. You can't feed into LSFG a framerate larger than what the sim can do while it's not using using frame generation. Everywhere in the sim, even in the worst conditions.

If it can't do 20 everywhere without FG, then you can't lock at 20 and get a smooth flight without stutters when you turn on LSFG "scaling".

Hello guys,

Thanks for the suggestions and help.

4 hours ago, level7 said:

Might be VRAM usage? perhaps check how that looks

I just checked it - with losless scaling turned on, have about 500MB spare VRAM.

 

19 hours ago, Nemo said:

Use MSFS nvidiaprofile to limit fps to 30, 20 or 15.

LLS nvidiaprofile set Vsync ON (not 1/2)

VSync in MSFS=OFF

When you activate the window, you should see 15/30 or 20/40 or 30/60 when scaling is set to x2.

 

9 hours ago, speedyTC said:

Curious as to why you have set RTSS to limit the frames to 15.

I believe the recommended limit is half of what your monitor refresh rate is capable of. For example, 100kHz refresh -> RTSS set to 50.

So I sit at YMML ORBX with the PMDG 737, at 4K I can maintain about 28-30 FPS.  Not quite a solid 30 FPS that I usually like to Vsync with (monitor at 30Hz).  So I thought - I'll try capping FPS at 20, turn my monitor back to 60Hz and try X3 Vsync in LS.  Then I realised, in some situations (i.e. looking the wrong way with a bit of traffic, it may dip to 18 FPS or so from time to time before climbing back up).  So I went 15 FPSl, X2 and 1/2 Vsync.  This should give a nice smooth result as it does in P3D, but instead frames as indicated by MSFS plummet to 8 or so.  Same happens when I do 20 and full Vsync.

Had a look at P3D again - the reason I went from 20 to 15 is that I can hold 20 happily, but when losless scaling is turned on I can't.  So I went down to 15 and all good.  I can hold that with losless scaling.

If anyone can make head or tail of this, I'll post my settings here and FPS display from MSFS here.

As I said, I think I know how to work it - I have it working for P3D fine.  Just seem to tank FPS with MSFS which doesn't seem to be everyone else's experience, so maybe I'm missing something.

Have some screenshots below:

Losless scaling settings (have tried multi-monitor and of off - no difference.  That's the only setting not visible in the screenshot):

https://drive.google.com/file/d/1QeXteC47guKi6zcBUayl9TGMxgnL3-_e/view?usp=sharing

Frames uncapped (MSFS Vsync off, monitor 60Hz etc):
https://drive.google.com/file/d/1Czg4blZZ6bgtz4MoBo5WdoYTnixWeVYU/view?usp=sharing

Frames capped at 20:
https://drive.google.com/file/d/1RQTdYUW_nsGDaYxmbySjbPt44FO_FSnY/view?usp=sharing

Frames capped at 15:
https://drive.google.com/file/d/1VPU6cLeJxoPA4YPMeGd7zoufUDXfFj2C/view?usp=sharing

Loselss scaling on:

https://drive.google.com/file/d/175mzhAhTVfZyH8T82DlUnJiLklrm80qG/view?usp=sharing

PS sorry for no embedded images - was going to be here until the end of the universe to make it play nicely.

 

 

 

Edited September 2, 20241 yr by VHOJT

Interestingly, I had this phenomenon just now when playing around with Lossless. All of the sudden, after clicking on "scale now", the FPS plummetet down to 8-10 instead of amplyfing it. While 5 seconds before it was ok. No idea, turned off the sim and will try again later. Unless you found a solution or the culprit of this behaviour?

Since the latest update I have the issue that at approach the main screen freezes and the side monitor runs normally …

Unscaling , shutting down LLS and restarting the app solves it.