Limited by Mainthread with 30fps with 9800x3D

User Support Hub Install, Performance & Graphics
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41

You are right! My fps are also better with 577. Ca 20fps more native. I dont know if this was also the main problem before. But now with 577 is really fine. I have native now with all maxed out settings inclusive Lod at maximum and 4k always 60fps+. That was before 40fps+. And with the bug ?? at the beginning the thread 25fps+.

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42

Iā€™m experiencing the same MainThread limitation issue and wanted to share my troubleshooting journey and current symptoms. Despite trying multiple fixes, Iā€™m still stuck with poor performance.

System Specs:

  • AMD Ryzen 7 5700X3D

  • RTX 4070 Ti Super (16GB VRAM)

  • 32GB DDR4 RAM

  • 1080p 60Hz monitor

  • SU5 installed

Symptoms: Running dev mode FPS counter shows:

  • MainThread: 19.4 ms (consistent bottleneck)

  • Manipulators: 7.1 ms

  • CoherentGTUI: 5.7 ms

  • These two alone consume 12.8 ms (66% of total MainThread time)

  • MarkersFailed: 50

  • CPU usage ~41% distributed across all cores (no single core pinned at 100%)

The issue occurs:

  • Even in the main menu (60 fps locked but ā€œlimited by mainthreadā€)

  • In Free Flight and Career Mode

  • With multiple default aircraft (PC-12, Cessna 172/152, Eurocopter)

  • In remote locations with minimal scenery load

  • Changing graphics settings from Ultra to Low makes zero difference (still ~42 fps)

What Iā€™ve tried:

  1. Removed all Community folder mods except FSUIPC7

  2. Removed FSUIPC7 completely ā†’ gained only 3-4 fps

  3. Set process priority to High (also tried Normal)

  4. Verified all CPU cores enabled in affinity

  5. Disabled AI Traffic ā†’ finally getting ~60 fps but unstable

Current Settings:

  • Graphics Preset: High End

  • TAA @ 100% @ 1080p

  • Motion Blur: Off

  • Depth of Field: Off

  • VSync: Enabled (in-game)

  • FPS Limit: Off

  • Nvidia App: Default settings (no custom tweaks)

Current Status: With AI Traffic disabled, I can barely maintain 60 fps, but itā€™s unstable. The high Manipulators and CoherentGTUI times persist regardless of settings. The fact that graphics settings changes have zero impact strongly suggests this is a MainThread/CPU-side bug rather than a configuration issue.

Has anyone found new solutions post-SU5? Are the elevated Manipulators + CoherentGTUI times a known bug that Asobo is addressing? Any other suspects I should investigate?

FlightSimulator2024_o8uQqanKSQ
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1 Like
43

You might try Max FPS 40 in the Sim Settings, with Vsync OFF.

The Mainthread is not reporting correctly. If you watch the Mainthread right at the start, you will see it reporting 8ms frames then it goes up to 20ms frames. I believe whatā€™s happening here is that the frames are queuing up, and the frame times are counting from the time entering the queue to the time exiting the queue. My advice: ignore the Mainthread timings. Is it smooth? If Yes, turn off the FPS counter.

44

No it is not unfortunately. This is why I responded to the topic. What I did now is completely deactivate any traffic and it runs much smoother, but that actually is not a viable solution for meā€¦