How to install cellxgene interactive tool?

Is there any detailed instruction how to install cellxgene interactive tool?
And the cellxgene interactive tool on galaxy.eu runs very slow. Does any one know the reason?

I set the config files: galaxy/tools/interactive/interactivetool_cellxgene.xml
galaxy/config/tool_conf.xml (uncomment interactivetools section) and set the galaxy/config/galaxy.yml from galaxy.yml.interactivetool
What else should I do?