I have a problem: I can't find a good YouTube downloader that would allow me to download entire playlists, not just one video at a time. Are there any services or apps that can do this without slowing down the download process? Playlists often contain a lot of videos, so I need something stable.

I use youtube downloader Y2Mate to download entire playlists, and it's the most convenient service I've found. It allows you to download entire playlists, you don't have to manually download each video. It saves a lot of time, especially if the playlist is really big. I suggest you try it and you will use it all the time!