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macOS Screen Capture performance degradation in macOS Sonoma #10636
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Around here setting |
cc @PatTheMav |
The problem with The way I understand this bug report, is that using window capture in macOS 13 provided samples at the native window resolution (identical to the resolution observed in desktop capture) but performance regressed in macOS 14 (the expectation being that users can still capture window contents at their retina size with the same performance impact as on macOS 13). @jcm93 do you remember/can you confirm that window capture in macOS 13 provided window contents at their actual retina resolutions? |
Yes, macOS 13 certainly provided retina-resolution buffers to OBS in the window capture mode. The provided resolution of captures for OBS has, to my knowledge, always been consistent (other than an issue in the Sonoma beta, since resolved). The performance while maintaining the same functionality is the sole concern here. |
Any updates on this? Facing the same issue (sorry for the bump!) |
Hi @dinvlad, Definitive steps would be helpful. We've seen anecdotal data that capturing a Safari tab while playing a video, or doing multiple independent window captures, or capturing while editing a file in preview cause issues. When we investigate, we don't really see much difference of note between macOS 13 and macOS 14 while performing these actions within OBS. We remain interested in understanding the issue! |
Thanks @Developer-Ecosystem-Engineering - for me it's severely lagging while doing anything at all with a single capture of the entire external display (4k@240Hz native resolution captured at 1080p@60), seemingly whether it's navigating in a browser or another app. I don't get the same lag when I disconnect the external display and capture my Macbook M2 Max's XDR screen directly, but the GPU is still pegged at ~40% (compared to ~80% with external). Perhaps the high refresh rate on the external monitor matters? The ~2x factor in GPU load between 4k@240Hz on the external vs ~4k@~120hz (adaptive) on internal display would seem to explain this. However, I feel like even 40% is already pretty high, for something like this (especially that it encodes only to 1080p). Or is that indeed a pretty heavy task? |
I'm still experiencing this, even without a video source turned on. It wasn't an issue in previous OBS versions, so I think there might be something more fundamental going on.. EDIT: It seems this is caused by the external monitor just being connected. If I disconnect it, start OBS and then connect it again, it seems to do fine. Perhaps this is related to #9832 then? Please note that I did use the same setup with another external monitor (4k@120Hz) previously, and this wasn't an issue. |
We remain engaged on the issue, just don't have an answer/solution quite yet. Appreciate the communities patience, we are working on it with the team. |
This issue is largely additional public tracking for a known macOS-side issue, filed as FB13691162.
Operating System Info
macOS 14
Other OS
No response
OBS Studio Version
30.1.2
OBS Studio Version (Other)
No response
OBS Studio Log URL
https://obsproject.com/logs/BaJhSqdClapbHqzK
OBS Studio Crash Log URL
No response
Expected Behavior
macOS Screen Capture performance should remain relatively consistent between macOS updates; users should not notice significant degradation in the framerate, performance, or number of simultaneous captures their system can support. macOS Screen Capture should also not significantly impact the responsiveness of macOS in general.
Current Behavior
In macOS Sonoma, SCK (macOS Screen Capture) performance has degraded somewhat significantly. Users have noted degraded framerates, increased incidence of rendering lag for setups that used to perform acceptably, a decrease in the number of simultaneous captures their system can support, as well as degraded performance around the rest of macOS while SCK is active. The Window Capture mode is noted as being particularly unusable at present due to the amount of rendering lag it creates.
Steps to Reproduce
Anything else we should know?
It is apparent that these performance concerns primarily exist with the Window Capture mode.
There are also performance concerns even with the Display and Application Capture modes, though they generally seem less severe than the degradation involving Window Capture.
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