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Docker push is so slow recently

I built a image (10 GB) and pushed it to Docker Hub.

docker push my_dockerhub_user/my_image

Recently, the uploading speed was so slow and needed 30~40 hours to finish the task.
However, I needed only 10+ mins to finish the uploading before.
I check the uploading speed of my server. It seems to be normal (661.66 Mbit/s).

What other reasons cause the pushing problem? Thanks.