Earlier quoted context omitted.
If Google really wanted to make the web fast, they would add native support for text/markdown mimetype in Chrome and ask publishers to just create .md files instead.
text/markdown is a bad idea because it's not backwards compatible. It should be text/plain; markup=markdown, since Markdown is perfectly readable without any software support. See https://blog.freron.com/2011/thoughts-on-writing-emails-usin... for more thoughts on this topic.
Edit: rendered, not tendered