Docker-proxy does not cache

I have configured docker-proxy repository.
I successfully pull and push images using docker-proxy and docker-hosted repos.
The problem is every time I download image it downloads from scratch. I do not know how can i configure it so that it could cache and download fast. Speed is the same, so what is the use of proxy? Moreover, i cannot see any image in docker-proxy repository. Should I see if it is cached? Cause I can see list in docker-hosted.