Slow downloading speed of swupd

I had jumped over to Clear Linux. I’ve just found out that swupd only used ~25% of the bandwidth. Because when I download the ISO file from alternative CDN, it uses the whole bandwidth (5.7MB/s), but when I download the packages bundle with swupd the speed is just ~1.7MB/s.
I do know about --max-parallel-download but still happen the same.
So how do I resolve this issue?

Note: this topic is forwarded from this issue which is previously posted by me on swupd’s repo on GitHub

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