Please don't use Quay for official open source images if you care about international users, or at least offer a Docker Hub option as well. Quay is super slow compared to Docker Hub. When I contacted support back in July, they were very polite and professional, but in the end "everything is being served from AWS's US East region". Peak time performance is intolerable. It was so bad that our systemd units were timing out even with a massive 5min TimeoutStartSec.

To worsen the issue, Quay still doesn't seem to support parallel layer downloads, and Docker 1.9 even complains that "this image was pulled from a legacy registry. Important: This registry version will not be supported in future versions of docker."

I just ran a quick test (way off peak time) and Quay was 2.5x slower than Docker Hub for an image built from the same Dockerfile.

I'm looking forward to more usable international service at some point, but right now it just isn't really worth it.