The differences on other phones are smaller to non-existent because they are generally unable to draw faster than the screen refresh rate
🙂 My iPhone 11 for example manages to just barely touch 60 fps in some scenes, but the iPhone 12 goes up to 70 fps. I think that @
Significant1 is correct that there might be additional factors (like the overhead in actually displaying the image), but they are all very small compared to the forced vsync.