Bug 1875937 Comment 0 Edit History

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I'm using macOS 13.6.1: I can't confirm if this affects other operating systems.

# Steps to reproduce
1. Attach an external display that supports a 24 Hz refresh rate (I'm using a Samsung Frame TV)
2. Set the 24 Hz refresh rate on the external display (System Settings -> Displays -> Click external display -> Refresh Rate)
3. Play Netflix content (presumably content that is 24 Hz) in fullscreen (I'm using the [Kingdom series](https://www.netflix.com/browse?jbv=80180171) which, warning, has violent content)

## Expected results
Playback is smooth

## Actual results
Playback is smooth for a 5-10 seconds and then stutters heavily for a few seconds. This effect is especially noticeable during the end credits when names scroll up the screen at an even pace. I'm using a high-end MacBook Pro from 2019 so I don't expect to have performance issues.

**I cannot reproduce this issue in Safari.** I will attach videos from my phone of the issue in Firefox and the lack of issue in Safari. I used the profiler in a new Firefox profile under several different configurations. I started the profile, waited for the stuttering to start (10-15s), and ended the profile just after the stuttering stopped. I don't see anything obvious in the profiles:
- Firefox config: https://share.firefox.dev/3vEa9Le
- Media config: https://share.firefox.dev/48JYIAf
- Graphics config: https://share.firefox.dev/3SCYOo1

fwiw, I've subjectively felt video playback on my laptop (i.e. presumably at 60 Hz) on Netflix to be less smooth in Firefox than in WebKit browsers so I wonder if a similar issue exhibits at all refresh rates but is less noticeable with more frames.

Note: my external display exhibits other strange behavior at 24 Hz. Every 5-10s, the text and UI elements get blurry but the video content does not – I wonder if it's related to the computer trying to sync its 60 Hz refresh rate with the 24 Hz display.
I'm using macOS 13.6.1: I can't confirm if this affects other operating systems.

## Steps to reproduce
1. Attach an external display that supports a 24 Hz refresh rate (I'm using a Samsung Frame TV)
2. Set the 24 Hz refresh rate on the external display (System Settings -> Displays -> Click external display -> Refresh Rate)
3. Play Netflix content (presumably content that is 24 Hz) in fullscreen (I'm using the [Kingdom series](https://www.netflix.com/browse?jbv=80180171) which, warning, has violent content)

## Expected results
Playback is smooth

## Actual results
Playback is smooth for a 5-10 seconds and then stutters heavily for a few seconds. This effect is especially noticeable during the end credits when names scroll up the screen at an even pace. I'm using a high-end MacBook Pro from 2019 so I don't expect to have performance issues.

**I cannot reproduce this issue in Safari.** I will attach videos from my phone of the issue in Firefox and the lack of issue in Safari. I used the profiler in a new Firefox profile under several different configurations. I started the profile, waited for the stuttering to start (10-15s), and ended the profile just after the stuttering stopped. I don't see anything obvious in the profiles:
- Firefox config: https://share.firefox.dev/3vEa9Le
- Media config: https://share.firefox.dev/48JYIAf
- Graphics config: https://share.firefox.dev/3SCYOo1

fwiw, I've subjectively felt video playback on my laptop (i.e. presumably at 60 Hz) on Netflix to be less smooth in Firefox than in WebKit browsers so I wonder if a similar issue exhibits at all refresh rates but is less noticeable with more frames.

Note: my external display exhibits other strange behavior at 24 Hz. Every 5-10s, the text and UI elements get blurry but the video content does not – I wonder if it's related to the computer trying to sync its 60 Hz refresh rate with the 24 Hz display.

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