I was trying to figure out why Safari’s Reader animation was smooth on my retina MacBook display (“1680×1050”), and super smooth on my old iPad Pro (1668 x 2224), but jerky/stuttering on my USB-C-connected external 4K monitor in any resolution except “1280×720”. This even happened on simple web sites with very few photos.
Turns out it’s the VRAM. From iCruiser7 on Reddit:
Pushing high-res external monitors primarily depends on VRAM size and bandwidth. Integrated graphics have to use system RAM as VRAM which is slower compared to dedicated VRAM. If you only had 8GB system RAM then the shared VRAM would further strain the entire system since less system RAM is available to apps.
Now, the new G7 graphics have more computational performance and are coupled with faster 3733 LPDDR4X system RAM which provides more bandwidth so performance on an external display should be at least somewhat better. However, a discrete graphics card would bring much more improvement. So if pushing high-res external monitors is your goal, I’d recommend you either 1. upgrade to a 16-inch MBP or 2. get a eGPU.
I looked into eGPU prices and they can be $300 for the enclosure alone. And $700 for an Apple-recommended one with a video card included. The cheapest MacBook Pro 16″ with an extra video card included is $2100! I’m going to pass on that and see what external graphics performance is like on Apple Silicon.
Wish there was a way to turn Safari’s reader animation off. If anyone knows how, please let me know.