Google is constantly improvising YouTube's video streaming experience by switching to optimized video formats and enhanced streaming technology. This enhancement in the YouTube experience may help some users but in the meanwhile also annoys quite a few users on slow Internet connections.
One of the things which annoys me and probably many out there about YouTube, is restricting from being able to buffer the video when it is paused. Yes, I hate this. I have a slower Internet connection and I always prefer quality content (at least 480p) but YouTube's adoption of Dynamic Adaptive Streaming over HTTP (DASH) does not allow me to buffer the video when it is paused. Due to this problem I end up watching low quality videos.