1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

FPS and Render frames ahead

Discussion in 'Automobilista 2 - Help & Support' started by Petrolhead, Oct 16, 2021.

  1. Petrolhead

    Petrolhead Member AMS2 Club Member

    Joined:
    Mar 1, 2020
    Messages:
    217
    Likes Received:
    21
    I thought you could set the max frams rate (FPS)?

    What should I set the RENDER FRAMES AHEAD to?
     
  2. Shriukan

    Shriukan Touristenfahrten Community AMS2 Club Member

    Joined:
    Sep 23, 2019
    Messages:
    1,293
    Likes Received:
    931
    To set a cap on FPS, open steam launch parameters and add "-fpscap xxx" (x being the amount of frames - you might need to raise by 1 to 3 frames)

    As for render frames ahead, the lower the value, the less input lag, but the quicker your GPU needs to be able to work in order not to miss frame timing.
     
  3. Petrolhead

    Petrolhead Member AMS2 Club Member

    Joined:
    Mar 1, 2020
    Messages:
    217
    Likes Received:
    21
    Thanks re FPS

    So a RTX 3090 should be ok with Render Frames = 1
     
  4. Marius H

    Marius H Internal Beta Tester Staff Member AMS2 Club Member

    Joined:
    Mar 24, 2016
    Messages:
    5,251
    Likes Received:
    2,010
    Yes, totally. :D
     
  5. Raf Nix

    Raf Nix New Member

    Joined:
    Mar 10, 2021
    Messages:
    16
    Likes Received:
    4
    ..isn't it the other way around, the more Render Frames Ahead the faster the GPU needs to calculate?

    "• Render Frames Ahead
    This setting is there to create some marginal amount of buffering to the displayed images. You can fight stutter with that, at the cost of some lag, and with a severe performance overhead."
     

    Attached Files:

    Last edited: Oct 16, 2021
    • Agree Agree x 1
    • Useful Useful x 1
  6. Shriukan

    Shriukan Touristenfahrten Community AMS2 Club Member

    Joined:
    Sep 23, 2019
    Messages:
    1,293
    Likes Received:
    931
    As usual this is a balance of performance thing. Yes you need more gpu power to render things earlier but it also gives more time for each frame to be generated. frame drawing isn’t a perfectly timed thing. some frames take more times to be drawn, some less and this can be due to many factors aside for the amount of activity in the change between each frame.

    so an example is that at 60 fps, you have 50ms to draw 3 frames. they need a bit more gpu power and some memory to buffer them but it’s still 50ms to get the first frame out. so if the first frame takes say 20ms to render, the next frame only has 46 (which is still enough). if 2 frames take 20ms, the third frame has 42. it makes longer frame rendering much more forgiving but as it says, at the cost of input lag and you don’t want this in a racing sim

    at a single frame rendered ahead, your gpu has 16ms to draw and show the frame. so with each individual frame only having 16ms, if something happens to make the render time go above 16ms, you get stutter and/or frameskip depending on how things are configured and the gpu hastens to catch up

    and finally, your gpu has another setting under the hood: Ultra Low Latency Rendering, meaning there is no buffer at all. The moment the frame is rendered it is output and the next frame is rendered right after. It is much easier to notice the stuttering effect as there isn’t even a 16ms buffer to time each frame. I don’t recommend to use this at 60fps when using anything less than a 2000 series gpu since those cards have a much better direct frame rendering timing.
     
    • Informative Informative x 3
    • Like Like x 1
  7. Austen Fitzpatrick

    Austen Fitzpatrick New Member

    Joined:
    Jul 4, 2020
    Messages:
    9
    Likes Received:
    3
    I know it goes against what everyone advises and I myself tried it for ages but I find using vsync works so much better for me. I bought into the disabling vsync and capping fps to lower input lag but I found the handling felt strange. Once reverting back to vsync it's like the game 'syncs' up again and wierdly the car seems easier to rotate... not sure why that is? Vsync all the way.
    (Also found my kill rate in fps games have massively improved with vsync)
    Don't always buy into the hype/advise that's out thier on input lag.:)
     
  8. MarvinButterfly

    MarvinButterfly New Member

    Joined:
    Jan 2, 2024
    Messages:
    1
    Likes Received:
    0
    Amazing!!!
    How is it possible though that wgen i was using low shadows, low particles and low reflections i wasn't able to avoid some lag?
    I thought those things were the worst to keep high for performance!!!
    Now it flys!!!!
    Any suggestions for Assetto Corsa as well?
    Thanks for your help mate
     
  9. F1Aussie

    F1Aussie Well-Known Member AMS2 Club Member

    Joined:
    Mar 21, 2016
    Messages:
    2,165
    Likes Received:
    606
    So what did you change the setting to?
     
  10. Nolive721

    Nolive721 Active Member

    Joined:
    May 17, 2020
    Messages:
    404
    Likes Received:
    119
    Curious to know as weĺl.
     

Share This Page