Netflix is superior to Disney+ in this regard (at least on my TV).
And on my TV Netflix manages sub-second (at least sometimes). IDK how. Maybe they somehow give me the DRM keys ahead of time? Maybe everything in the "continue watching" is pre-approved? Maybe the first couple of seconds are handled differently, maybe they are not DRM protected? Maybe the netflix intro logo thingy is cached locally, and then stuff happends in the background? It is after all more pleasant to hear the intro sound that watch a spinning loading-thingy. Maybe as I move the selection across stuff they pre-emptively fetch the first seconds? In some cases it also seems to start auto-playing in the background, so the only thing that happends when I press a selection is that the GUI overlay dissapears.
And on my TV Netflix manages sub-second (at least sometimes). IDK how. Maybe they somehow give me the DRM keys ahead of time? Maybe everything in the "continue watching" is pre-approved? Maybe the first couple of seconds are handled differently, maybe they are not DRM protected? Maybe the netflix intro logo thingy is cached locally, and then stuff happends in the background? It is after all more pleasant to hear the intro sound that watch a spinning loading-thingy. Maybe as I move the selection across stuff they pre-emptively fetch the first seconds? In some cases it also seems to start auto-playing in the background, so the only thing that happends when I press a selection is that the GUI overlay dissapears.