Your mobile processor can handle a couple of threads of download per core. If you’re downloading from multiple locations and aren’t throttled and have a phone with many cores, it can go faster. Realistically, to min/max, the software should know what your max configuration is and push that per download. Once a download fails to achieve the max, then it allows other downloads to bypass the queue. For large files, it’s almost always more efficient to focus on less streams if the streams can provide you the throughput.