• X-Plane 11.50 Beta 16: Less Weird, Slightly Faster

    X-Plane 11.50 Beta 16: Less Weird, Slightly Faster

    X-Plane 11.50 beta 16 is now out. Probably the most important bug fix is the set of fixes for broken plugin drawing–this affected SkyMaxx Pro and a number of add-ons in pop-out windows.

    At this point we think we are good in terms of plugin compatibility APIs – if your add-on still acts funny in beta 16, please let us know ASAP.

    Performance Investigations

    Sidney and I spent a bunch of time over the last week looking at performance. Here’s what we have found so far:

    1. X-Plane 11.50 beta 14 made cloud performance significantly worse on the GPU. I accidentally turned off optimized off-screen clouds. This is fixed as of beta 15.
    2. X-Plane 11.50 beta 15 made CPU performance worse on AMD cards on Windows during panel drawing – the same bugs that caused the incorrect plugin drawing hit performance as well. This is fixed as of beta 16. (XPD-10943)
    3. X-Plane 11.50 beta 15 leaks VRAM when scenery or the aircraft gets loaded. That doesn’t necessarily hurt performance but it’s definitely not good. This is fixed in beta 16 (XPD-10941). If you had blurry textures, definitely re-test now.
    4. NVidia cards are losing about 1.5 ms of GPU time as a result of the bug fix for wrong reflections in Vulkan. We found the cause of the performance loss but we have not fixed it yet. This was introduced in beta 12 when we fixed the reflections. (XPD-10953)
    5. Temporary slow frame rate or stutters when turning your head with Vulkan. If your frame rate is smooth and good when flying and then temporarily slows down only when your view changes as lot (e.g circling, turning your head, etc.), that’s this bug. The cause is slower draw time when we draw 3-d scenery out of system memory while we wait for the DMA to VRAM to finish. (XPD-10898)

    From what we can tell, a huge percentage of the blog comment complaints about performance are all XPD-10898.

    At this point, with beta 16, we do not want any additional performance bug reports. Given that we have two performance issues fully diagnosed but not fixed, there’s no point in collecting more data – the two existing problems would mask other ones. We are also drowning in performance bug reports at this point; we don’t have bandwidth to triage additional ones right now.

    Ben Supnik
    Source


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