speed deviation with custom domain

Hello, trying to sending objects ( <= 100 MB) with custom domain.

The download speed deviation is severe on the same device, COLO. (40 mb/s to 6 mb/s, HKG)

I checked with several users and found that some users were very fast or slow even though COLO was different. (mostly HKG, KIX)

Could this be caused by a setup problem? Can I get some advice?
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