[Webkit-unassigned] [Bug 173434] Support for 120Hz requestAnimationFrame

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173434

--- Comment #56 from Jeffrey Blanz <jeff03blue at gmail.com> ---
(In reply to mdrejhon from comment #50)
> (In reply to Jeffrey Blanz from comment #46)
> > It appears all Apple devices, including with external monitors on macs,
> > support native animations except for iPhone Pros.
> 
> I have recently gotten mixed reports on native animations support for
> >120Hz, I have bought way more equipment and proudly own a MacBook for
> 10-hour Visual Studio Code sessions that needs 120Hz and HDR testing, so
> MacBook is my TestUFO development machine now!  TestUFO HDR launch is
> delayed until browsers become a bit less buggy in this area;
> 
> It's been a while, but if you connect a 144Hz monitor to a Mac, Safari
> stubbornly still does 120fps and scrolling stutters badly.  I need to do
> more tests, but there are possibly two reasons:
> 
> (1) The internal display (e.g. MacBook display is still at 120Hz).   
> The animations may go native if you disconnect the display.  
> 
> (2) Or Apple may have fixed 144Hz+ support in some situations.
> 
> But with latest MacOS AND if you turn off the internal display, external
> displays now seem to go native - no more 120Hz interference from a
> concurrently-running 120Hz ProMotion display. 
> 
> Still wish my MacBook was OLED, as it's one of the blurriest 120Hz displays
> I've ever used -- Apple priorities good HDR and color, but definitely not
> 120Hz motion performance.  It's only 1.1x better than 60Hz in scrolling
> clarity.  Part of this is because LCD overdrive is disabled on almost all
> laptops, including Apple, and excellent-color LCDs are usually slower too. 
> But OLED lets you have cake and eat it too, and so I am absurdly excited
> about OLEDs speeding up the refresh rate race due to more everyday consumer
> benefit.  
> 
> TechSpot mainstream writer recently wrote (in their March 22, 2024 lack of
> OLED burnin update) "...The 240Hz refresh rate at 4K is much better than I
> was expecting for productivity work. Relative to the 144Hz LCD I was using,
> the combination of a higher refresh rate and faster response times makes
> this QD-OLED much nicer to use for everyday tasks. Especially when browsing
> the web and scrolling through text, the speed and refresh rate combination
> is noticeable and provides a smoother, clearer experience – so it's not just
> gaming where you'll benefit from a 240Hz refresh rate..."
> 
> (So, OLEDs makes the human-benefits of extra Hz much more visible -- 240Hz
> is no longer just for esports)

When you hook up your MacBook Pro to a 144hz monitor, does testufo on chrome show 144hz?

Wondering if this is a software limitation with outputting on external displays, and not a limitation with safari. This would be like how iPad Pros can only output 60fps to an external display, regardless if the external display is 120hz.

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