Remove i1.wp.com/ from default avatar link

Hi, I using an external link with Add New Default Avatar plugin that displays i1.wp.com/defaultavatarlink.com, instead of defaultavatarlink.com

any suggestions on removing unnecessary i1.wp.com/ ? it slows down loading of site. below is php code for plugin.

http://trepmal.com/plugins/add-new-default-avatar/