macOS 26 decoding latency is too slow
Opened this issue · 23 comments
I recently upgraded to the latest macOS 26.0 Tahoe, Moonlight decoding latency increate to 80ms.
Client PC details (please complete the following information)
- OS: [mac OS 26]
- Moonlight Version: [v6.1.0]
- GPU: [Intel Iris Plus]
Server PC details (please complete the following information)
- OS: [Windows 10 latest]
- Sunshine or GeForce Experience version: [Sunshine v2025.829.135256]
- GPU: [RTX 2060]
- GPU driver: [latest]
Moonlight Logs (please attach)
Moonlight-1758166237.log
Xhxdhvdd4y
Yeah this is absolutely atrocious after upgrading to macOS 26, my video decoding latency is spiking to >100ms. It seems to primarily happen when in windowed mode. In fullscreen it's still pretty bad, around 20-25ms, but much lower than windowed. Tried vsync/frame pacing both on and off.
OS: macOS 26.0 25A354
Moonlight version: 6.1.0
GPU: Intel UHD 630 / Radeon Pro 5500M
Macbook Pro 2019 16", the last Intel model
It looks like both of you have older Intel Macs. Is anyone experiencing this with Apple Silicon Macs?
Can you try to run Moonlight with the Metal renderer disabled? You can do so by running it from Terminal with the following command:
VT_FORCE_METAL=0 /Applications/Moonlight.app/Contents/MacOS/Moonlight
Can confirm I was experiencing the same issue on Apple Silicon - 2024 Mac Mini M4 Pro.
Running with the Metal renderer disabled resolved my latency issues and it's running like it was before.
Edit: If it's useful, log stats from metal enabled vs disabled:
Enabled
Incoming frame rate from network: 36.98 FPS
Decoding frame rate: 36.98 FPS
Rendering frame rate: 20.97 FPS
Host processing latency min/max/average: 3.8/230.0/4.5 ms
Frames dropped by your network connection: 0.00%
Frames dropped due to network jitter: 30.56%
Average network latency: 1 ms (variance: 0 ms)
Average decoding time: 2.37 ms
Average frame queue delay: 36.24 ms
Average rendering time (including monitor V-sync latency): 1.06 ms
Disabled
Incoming frame rate from network: 58.66 FPS
Decoding frame rate: 58.66 FPS
Rendering frame rate: 58.60 FPS
Host processing latency min/max/average: 3.8/230.0/6.6 ms
Frames dropped by your network connection: 0.05%
Frames dropped due to network jitter: 0.08%
Average network latency: 1 ms (variance: 0 ms)
Average decoding time: 2.69 ms
Average frame queue delay: 8.61 ms
Average rendering time (including monitor V-sync latency): 0.28 ms
The log from Metal enabled was full of SDL Warn (0): Presentation wait timed out after 100 ms
That slowdown doesn't appear to be from decoding time, but rather network jitter, which may be another issue we've been experiencing on macOS -- #1598 . The "Presentation wait timed out" is present there as well.
I attempted to run without the metal renderer, but am getting very inconsistent results across the board, between this new issue and the Sequoia network jitter issue. Rarely I'll get decoding time as low as 3-5ms, most of the time it is around 25-30ms, with both metal rendering and non-metal rendering. Sometimes spiking up to >120ms until I restart the stream.
The one thing that consistently lowers decoding time to <5ms is disabling hardware acceleration. With software decoding it is always fast, but obviously uses quite a bit of CPU.
Thanks for the correction. I hadn't experienced the issue before Tahoe, so I'd assumed it was the same as you'd described.
I am getting the same performance as always, running M4 Pro, both host and client connected to gigabit ethernet. No degradations or improvements.
I experienced higher latencey (not as high as OP) after reinstalling a fresh MacOs26 on my M2 Pro, and i have clones the github rebuilding the app and enabled Game mode and i am back down to around 3.3-3.7ms at native resolution hdr on 120hz
Can confirm I was experiencing the same issue on Apple Silicon - 2024 Mac Mini M4 Pro.
Running with the Metal renderer disabled resolved my latency issues and it's running like it was before.
Edit: If it's useful, log stats from metal enabled vs disabled:
Enabled
Incoming frame rate from network: 36.98 FPS
Decoding frame rate: 36.98 FPS
Rendering frame rate: 20.97 FPS
Host processing latency min/max/average: 3.8/230.0/4.5 ms
Frames dropped by your network connection: 0.00%
Frames dropped due to network jitter: 30.56%
Average network latency: 1 ms (variance: 0 ms)
Average decoding time: 2.37 ms
Average frame queue delay: 36.24 ms
Average rendering time (including monitor V-sync latency): 1.06 msDisabled
Incoming frame rate from network: 58.66 FPS
Decoding frame rate: 58.66 FPS
Rendering frame rate: 58.60 FPS
Host processing latency min/max/average: 3.8/230.0/6.6 ms
Frames dropped by your network connection: 0.05%
Frames dropped due to network jitter: 0.08%
Average network latency: 1 ms (variance: 0 ms)
Average decoding time: 2.69 ms
Average frame queue delay: 8.61 ms
Average rendering time (including monitor V-sync latency): 0.28 msThe log from Metal enabled was full of SDL Warn (0): Presentation wait timed out after 100 ms
Hi, How to disable Metal Rendering?
I experienced higher latencey (not as high as OP) after reinstalling a fresh MacOs26 on my M2 Pro, and i have clones the github rebuilding the app and enabled Game mode and i am back down to around 3.3-3.7ms at native resolution hdr on 120hz
could you share your .dmg with gamemode?
Use this fork
https://github.com/andygrundman/moonlight-qt/releases/tag/v6.1.0-game-mode
Thanks!
I have the same issue, the Game Mode fork above did not help but disabling the Metal renderer did, it's back to being nice and smooth at 4k120fps on my M1 Pro.
Wanted to note my experience here in case it helps. I have an MBP M1 Max that I have been using with Tahoe since one of the developer betas.
I’ve tried the approaches in this thread to overcome the slow decoding, which often seemed to coincide with network jitter or frames dropped by network spikes. Though I’d say the average outside of those spikes was 7-15ms which was still higher than I was used to.
Tried:
- game mode fork
- newer appveyor build
- disable metal rendering
- force software decode
Nothing seemed to provide lasting or stable low latency until I changed the display mode from “borderless window” to either “fullscreen” or “windowed”. That has brought me back to a fairly consistent ~4ms decode latency with no network jitter.
Not something I had thought to try as my experience not using borderless windowed mode is usually the opposite.
Good news, i just tried moonlight on MacOS 26.1 beta 4 without gaming-mode build, hardware decode, h264, and alwd0 disabled ( by realtime app/ script) , everything smooth again. It seems Apple has fixed issue on previous versions 26.0 and 26.01.
I've made some changes to the Metal renderer. Please try this test build and let me know if it fixes the issue or not.
https://ci.appveyor.com/project/cgutman/moonlight-qt/builds/52959527/job/2yqndhuwklo6y66h/artifacts Use the updated build here: #1696 (comment)
(It's not developer signed, so you'll need to approve it in the Security Settings page)
I tried the new build, but it crashed on my Mac mini M4
(PS: I'm using macOS 26.1 beta, just to note)
`-------------------------------------
Translated Report (Full Report Below)
Process: Moonlight [57900]
Path: /Users/USER/Downloads/Moonlight.app/Contents/MacOS/Moonlight
Identifier: com.moonlight-stream.Moonlight
Version: 6.1.0 (6.1.0)
Code Type: ARM-64 (Native)
Role: Background
Parent Process: launchd [1]
Coalition: com.moonlight-stream.Moonlight [11292]
User ID: 501
Date/Time: 2025-10-24 10:21:16.2228 +0800
Launch Time: 2025-10-24 10:21:12.9598 +0800
Hardware Model: Mac16,10
OS Version: macOS 26.1 (25B5072a)
Release Type: User
Crash Reporter Key: 0EDC1661-251D-2D38-30B0-71294E699636
Incident Identifier: D63728F7-2521-4E0E-A331-97AAD87BAD0F
Sleep/Wake UUID: 7B1BF190-64D9-4041-AB69-106E81400927
Time Awake Since Boot: 170000 seconds
Time Since Wake: 8177 seconds
System Integrity Protection: enabled
Triggered by Thread: 0
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Termination Reason: Namespace DYLD, Code 1, Library missing
Library not loaded: /opt/homebrew//libX11.6.dylib
Referenced from: <6F39E1B6-E150-323B-8BC2-88A79A95EA0C> /Users/USER/Downloads/Moonlight.app/Contents/Frameworks/libswscale.9.dylib
Reason: tried: '/opt/homebrew//libX11.6.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew//libX11.6.dylib' (no such file), '/opt/homebrew//libX11.6.dylib' (no such file)
(terminated at launch; ignore backtrace)
Dyld Error Message:
1
Thread 0 Crashed:
0 dyld 0x18623a940 __abort_with_payload + 8
1 dyld 0x1862c0e20 abort_with_payload_wrapper_internal + 104
2 dyld 0x1862c0e54 abort_with_payload + 16
3 dyld 0x186243640 dyld4::halt(char const*, dyld4::StructuredError const*) + 312
4 dyld 0x18623f430 dyld4::prepare(dyld4::APIs&, mach_o::Header const*) + 3840
5 dyld 0x18623dd04 start + 7104
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000006 x1: 0x0000000000000001 x2: 0x000000016b249040 x3: 0x000000000000008c
x4: 0x000000016b248c40 x5: 0x0000000000000000 x6: 0x0000000000000000 x7: 0x0000000000000000
x8: 0x0000000000000020 x9: 0x267ca84b782100be x10: 0x0000000000016750 x11: 0x00000001f2cfc0a0
x12: 0x0000000000020000 x13: 0x0000000186235000 x14: 0x0000000000000013 x15: 0x0000000000000000
x16: 0x0000000000000209 x17: 0xcadd00016b248938 x18: 0x0000000000000000 x19: 0x0000000000000000
x20: 0x000000016b248c40 x21: 0x000000000000008c x22: 0x000000016b249040 x23: 0x0000000000000001
x24: 0x0000000000000006 x25: 0x000000001f070004 x26: 0x0000000000000000 x27: 0x000000016b24aec8
x28: 0x0000000000000000 fp: 0x000000016b248c10 lr: 0x00000001862c0e20
sp: 0x000000016b248bd0 pc: 0x000000018623a940 cpsr: 0x80000000
far: 0x0000000000000000 esr: 0x56000080 (Syscall)
Binary Images:
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0x1051bc000 - 0x105267fff libssl.3.dylib () <096d8654-8405-3f8e-9ee9-e24c92fee383> /Users/USER/Downloads/Moonlight.app/Contents/Frameworks/libssl.3.dylib
0x105cc0000 - 0x10603bfff libcrypto.3.dylib () /Users/USER/Downloads/Moonlight.app/Contents/Frameworks/libcrypto.3.dylib
0x106198000 - 0x1064affff libavcodec.62.dylib () /Users/USER/Downloads/Moonlight.app/Contents/Frameworks/libavcodec.62.dylib
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0x1053d8000 - 0x10545bfff org.qt-project.QtQmlModels (6.6) /Users/USER/Downloads/Moonlight.app/Contents/Frameworks/QtQmlModels.framework/Versions/A/QtQmlModels
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0x186235000 - 0x1862d3f67 dyld () /usr/lib/dyld
0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
VM Region Summary:
ReadOnly portion of Libraries: Total=1.3G resident=0K(0%) swapped_out_or_unallocated=1.3G(100%)
Writable regions: Total=25.1M written=128K(0%) resident=128K(0%) swapped_out=0K(0%) unallocated=25.0M(100%)
VIRTUAL REGION
REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
STACK GUARD 56.0M 1
Stack 8176K 1
__AUTH 2896K 317
__AUTH_CONST 52.4M 606
__CTF 824 1
__DATA 30.2M 581
__DATA_CONST 26.3M 629
__DATA_DIRTY 3463K 521
__FONT_DATA 2352 1
__INFO_FILTER 8 1
__LINKEDIT 598.2M 20
__OBJC_RO 78.3M 1
__OBJC_RW 2567K 1
__TEXT 685.3M 645
__TPRO_CONST 128K 2
dyld private memory 16K 1
page table in kernel 128K 1
shared memory 32K 1
=========== ======= =======
TOTAL 1.5G 3331
Full Report
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`
Can confirm the build does not run and crashes.
There was a bug in the FFmpeg version compiled into that test build. Here's a fixed version: https://ci.appveyor.com/project/cgutman/moonlight-qt/builds/52968241/job/m76bn6pgrx98vins/artifacts
Did quick test, I feel no difference compared to R2669. Runs the same, except VSR is missing. It still lags and has choppy switch to full screen animation or full screen to window mode animation on Tahoe.
By lag I mean the only bad thing is the switching animation from full to window and vice versa.
For me I can see the statistics of the new version is better, and felt a little better too
There was a bug in the FFmpeg version compiled into that test build. Here's a fixed version: https://ci.appveyor.com/project/cgutman/moonlight-qt/builds/52968241/job/m76bn6pgrx98vins/artifacts
This is substantially better than any version I've used thus far, even pre macOS 26. On my 2019 Intel MBP I was always at 20-30ms decoding time with hardware decoding, and sometimes spiking to 100-200ms since macOS 26. With this build and hardware decoding, I'm down to a consistent 2-5ms. Still much slower than Windows but a massive improvement.
The 50% network jitter reported in the other issue also appears to be fixed.
Thank you greatly for this!
+1 the updated build provided improves things greatly, for me back to the pre OS 26 level. I can play on wifi without feeling nauseous once more. Thanks!