system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can I watch some videos in 1080p with no problem but another video won't even open in 360p a minute later ? (On YouTube)
gpt
Is the second video popular? YouTube locally caches videos that are at least semi-popular, so you'll have an easier time trying to watch a Taylor Swift music video than a random video with <1000 views from 5 years ago.