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Very low FPS with MH-60 after MSFS 2024 SU5 – MainThread bottleneck, only happens with this aircraft

By Rober @Robvene
    2026-05-05 07:25:06.328Z

    Hello Miltech team and community,

    I would like to ask for help regarding a serious performance issue I am experiencing with the Miltech MH-60 in MSFS 2024 after the SU5 update.

    The problem is that the MH-60 is giving me extremely low FPS compared to every other aircraft I use in the simulator. This seems to happen only with the MH-60. Other complex aircraft, including the HPG H145, run normally on the same system, same simulator, and similar graphic settings.

    My hardware is:

    • **CPU: AMD Ryzen 7 9800X3D
    • **Motherboard: MSI MPG X870E Carbon WiFi / MS-7E49
    • **RAM: 64 GB DDR5-6000, EXPO enabled
    • **GPU: NVIDIA GeForce RTX 4090, 24 GB VRAM
    • **Main SSD: Samsung 990 PRO 2 TB NVMe PCIe 4.0
    • **Resolution: 7680 × 1440
    • **DLSS: Quality
    • **Frame Generation: Off during testing
    • **FPS limit: 60

    The MH-60 is installed through Contrail as:

    MH60 v1.1.0 – MSFS 2024 Native

    I installed it into the MSFS 2024 native Community folder:

    Community2024

    I also uninstalled and reinstalled the aircraft to make sure the installation was clean.

    The issue is shown clearly in the MSFS SDK FPS display. With the MH-60, I am getting results like:

    • **FPS: around 14–22 FPS
    • **Limited by: MainThread
    • **MainThread: up to around 102 ms
    • **Graphics Queue: around 14–16 ms
    • **CoherentGTUIThread: around 8–10 ms

    One of the worst readings I captured with the MH-60 was approximately:

    • **FPS: 14.9
    • **Frame time: 66.90 ms
    • **Limited by: MainThread
    • **MainThread: 102.9 ms
    • **RdrThread: 10.2 ms
    • **Manipulators: 8.9 ms
    • **CoherentGTUIThread: 10.2 ms
    • **Graphics Queue: 16.1 ms

    This suggests that the problem is not GPU-related, because the RTX 4090 is not the bottleneck. The aircraft appears to be causing a very heavy MainThread load.

    For comparison, with the HPG H145 in the same simulator, with high/ultra settings and very high LOD settings, I get around:

    • **FPS: 60
    • **Limited by: Graphics Queue
    • **MainThread: around 13 ms
    • **Graphics Queue: around 14 ms
    • **CoherentGTUIThread: around 4–5 ms

    So the simulator and my hardware seem to be performing normally with other aircraft.

    I have already tried the following:

    • Lowering Terrain LOD and Object LOD
    • Lowering glass cockpit refresh rate
    • Lowering traffic and airport services
    • Testing with DLSS Quality
    • Testing with Frame Generation disabled
    • Reinstalling the MH-60 native version
    • Making sure the aircraft is installed in the MSFS 2024 native Community2024 folder

    Despite this, the MH-60 still produces a very high MainThread time and very low FPS.

    Has anyone else experienced this issue after MSFS 2024 SU5?

    Is this a known issue with the MH-60 native version, or could there be a specific setting, variant, livery, duplicated folder, or compatibility issue that could cause such a heavy MainThread bottleneck?

    I would appreciate any advice or troubleshooting steps.

    Thank you very much.

    Reply
    • 2 replies
    1. Miltech Simulations @MiltechSimulations
        2026-05-05 08:01:02.615Z

        Hello,

        I have very similar specs - if not slightly lower - and unfortunately cannot replicate this issue, nor it has been reported by other users.

        Have you tried cleaning your MH60 WASM Folder? Could be a corrupted WASM file. CLEANING WASM FOLDER

        Reply
        1. R
          In reply toRobvene⬆:
          Rober @Robvene
            2026-05-05 18:39:46.713Z

            Hello,

            Good news. After cleaning the WASM folder, clearing cache, restarting Windows, and testing again, the performance has improved a lot.

            Now I am getting around:

            • FPS: around 50–52 FPS
            • Limited by: MainThread
            • MainThread: around 18 ms
            • Graphics Queue: around 12 ms
            • CoherentGTUIThread: around 10–11 ms

            This is with high/ultra graphics settings, Terrain LOD 400 and Object LOD 200.

            So the issue seems to have been related to cache/WASM or possibly a Community folder conflict. I will now start adding my other addons back gradually to see if one of them is causing the problem.

            Thank you very much for your help.

            I have a question...

            With my PC, which is slightly more powerful than yours, shouldn’t I be getting better performance, even when using three 1440p monitors?

            After your comment, I’m starting to have doubts about whether my performance is normal.

            Please note that the PC has been completely formatted and the only thing installed is MSFS 2024.

            Reply
            Reply