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FPS drop pattern finally found...

Discussion in 'Automobilista 2 - General Discussion' started by VFX Pro, Mar 12, 2022.

  1. VFX Pro

    VFX Pro Well-Known Member AMS2 Club Member

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    Watkins Glen
    Time Trial mode is creating issue with the FPS. Same car, same track, same time side-by-side.
    TT on the left 100 fps with little struggles (squiggly green line), Test Day on the right 120 fps rock solid.

    Guapore
    Same issue.

    See signature for technical details.


    upload_2022-3-12_18-59-34.png
     
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  2. GodzillaGTR

    GodzillaGTR Well-Known Member AMS2 Club Member

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    Could that have to do possibly with the Ghost feature? Just guessing, I really have no idea. 20fps is noticeable though
     
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  3. SaxOhare

    SaxOhare Well-Known Member AMS2 Club Member

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    I have a big difference in FPS in TT or "test day" 75 vs 110 on Long Beach,
    There is a difference from about 30 fps I have this with almost every car track combo, (The old open-wheelers are a bit more fps friendly)
    The only car where I don't have that is the F-Retro-Gen3-Turbo. on Long Beach it peaks to 133 fps in TT
    The times for this car are not recorded while i do have a ghost,
    So I think the fps-loss has something to do with recording the time, and not with recording the ghost.
     
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  4. BrunoB

    BrunoB TT mode tifosi BANNED

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    Good thinking.
    Maybe this ghost thing could have an impact - because the PC at least have to use some resources to display the replay of the ghost.
    Me guess ;)
     
  5. VFX Pro

    VFX Pro Well-Known Member AMS2 Club Member

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    I'll try turning off the ghost and see if the FPS issue goes away... but I really like to see you @SaxOhare and @BrunoB as transparent targets to compete against!! LOL :p
     
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  6. Marius H

    Marius H Internal Beta Tester Staff Member AMS2 Club Member

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    I've some fps dips, like the bridge-part at Monza. 20 fps less or so. Some sections on some tracks are unoptimized. Good to see TT hampering the FPS, tho. Another bug to tackle.

    Solve 1 bug in the code.. 99 bugs coming up. :D
     
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  7. BrunoB

    BrunoB TT mode tifosi BANNED

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    :D
    I like how serious you does test this issue out.
    But to exclude this possible ghost influence then you better turn off the "Display Ghost" somewhere in the game settings.
    Yes it sounds a bit conspira... but you never know :whistle:
     
  8. VFX Pro

    VFX Pro Well-Known Member AMS2 Club Member

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    Update...

    After not adding any "ghosts" to compete against (as suggested), the ~20 fps drop remains at Watkins Glen.

    Time recording hypothesis

    Since ghosted cars don't seem to have an impact in time trial mode, it leaves the other theory about the time recording being faulty at this track.

    Further investigating...

    I'm going to try different cars and track details (low, med, high, ultra) to see if it's a car shader issue or if there are some bad geometry that could be causing the issue.
     
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  9. VFX Pro

    VFX Pro Well-Known Member AMS2 Club Member

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    Is the FPS drop on Watkins Glen caused by...
    1. ...a car type? No, tried different ones, low FPS remain.
    2. ...the track details level? No, tried low and ultra, low fps remain.
    3. ....shadow details level? No
    4. ....vsync? No
    5. ...the fact this tracks lacks orange cones where the road splits? No, but that part is just annoying (;))

    upload_2022-3-13_10-42-31.png
    upload_2022-3-13_10-43-41.png

    At this point, I'll leave it Reiza to troubleshoot to make this track useable in TT mode.
     
    Last edited: Mar 13, 2022
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  10. VFX Pro

    VFX Pro Well-Known Member AMS2 Club Member

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    About the time tracking hypothesis...

    I just noticed a very small but a little hidden gem / easter egg of a feature. The timeboard keeps track of your name and your time as you pass the finish line. It makes me wonder if such texture-based tracking if messing up the FPS?

    Click on the image to make it bigger to better see what I mean.

    upload_2022-3-13_10-45-35.png
     
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  11. Roar McRipHelmet

    Roar McRipHelmet Well-Known Member AMS2 Club Member

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    Far-fetched hypothesis: Can network traffic problems somehow interfere with GPU performance, even when CPU usage appears unaffected?
     
  12. SaxOhare

    SaxOhare Well-Known Member AMS2 Club Member

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    My GPU gets throttled in Time Trial on Brasilia Outer (and other circuits)

    Driving the F-Retro Gen3 DFY GPU get to 66%
    Driving the F-Retro Gen3 Turbo the GPU uses 99% of its power (I use this as a reference car because it doesn't record times)

    On a test day the GPU is unlocked and can use its full potential again, 99% when driving the Gen3 DFY

    the 66% vs 99% that ratio corresponds to the FPS drop
    Maybe a mistake in the timings code, some call that reserves some GPU power
     
    Last edited: Mar 13, 2022
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  13. Roar McRipHelmet

    Roar McRipHelmet Well-Known Member AMS2 Club Member

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    Are we seeing a consistent pattern that only the cars that record times in Time Trial are affected by the GPU slowdown, while cars that don't record times are unaffected?
     
  14. CrimsonEminence

    CrimsonEminence Administrator Staff Member AMS2 Club Member

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    These things are even part of the changelogs afaik and no easter eggs. Fewest tracks have them active right now actually and the reported issue is way more wide spread.
     
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  15. SaxOhare

    SaxOhare Well-Known Member AMS2 Club Member

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    It seems unaffected. The not recording Gen3 Turbo is a bug, Maybe this bug gives the key to fixing the frame rate drop in time trial, since this car doesn't throttle my GPU in TT?
     
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  16. SaxOhare

    SaxOhare Well-Known Member AMS2 Club Member

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    As a reference, I tested the F-Retro Gen3 DFY in BETA on Brasilia (where recording the TT time also isn't possible). And here I have 99% GPU power and no FPS drop
     
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  17. VFX Pro

    VFX Pro Well-Known Member AMS2 Club Member

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    All hypotheses are good and possible but I would say that is most likely not the issue since I have a 1Gb fiber connection and 1Gb network card and using time trial. When I use Afterburner to monitor the issue, only the GPU usage line becomes very "squiggly", thus we can narrow it down to a frame rendering issue, not network.
     
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  18. Bull Shark

    Bull Shark Later has long since begun. AMS2 Club Member

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    There are more tracks with FPS drops , like Watkins Glen for example. :(


    Edit: I forgot to type the word “drops” after FPS :whistle:
     
    Last edited: Mar 13, 2022
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  19. SaxOhare

    SaxOhare Well-Known Member AMS2 Club Member

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    Yes i don't think it is track related
     
    Last edited: Mar 14, 2022
  20. VFX Pro

    VFX Pro Well-Known Member AMS2 Club Member

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    To be clear, you think because it only happens during TT Mode, that is not related to the track itself? Is that correct? Also, this significant FPS drop only happens at certain tracks which appear to be track related, thus making the root cause analysis even more tricky.
     
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