Wow, what a difference aria2c makes with yt-dlp: using yt-dlp's native downloader, a 11GB file from Twitch was estimated to take over 1 hour to download. Using aria2c with 16 concurrent connections and 16 threads (the maximum supported by aria2c), I got [download] 100% of 10.75GiB in 00:08:19 at 22.02MiB/s.
(Usage: yt-dlp URL --downloader aria2c --downloader-args aria2c:'-j 16 -x 16')