Comment by ZinnZirconium

youtube-dl is horribly slow.

Try youtubedown instead.

https://www.jwz.org/hacks/#youtubedown

Try Athlon1600/youtube-downloader instead.

https://github.com/Athlon1600/youtube-downloader

Try youtubedl-lazy instead.

https://github.com/yausername/youtubedl-lazy