dcolish/flask-markdown — pull request #11 by brownhead (2014-04-19 18:57:31+00:00)
Title: Fixed serious performance issue.

The more times you used converted documents, the slower the conversion would take. This could end up causing a single, small document to take 14 seconds to convert, making your site unusably slow.

See waylan/Python-Markdown#305 for some more information on this.