Can we use link_to to replace link_to_gfm in _issue.html.haml
Created by: honglyua
technical debt
i have discovered that if i replace link_to_gfm with link_to method in
https://github.com/gitlabhq/gitlabhq/blob/master/app/views/projects/issues/_issue.html.haml#L9
= link_to_gfm issue.title, issue_path(issue)
The time of show issue.title will reduce to 1ms, while using link_to_gfm, it takes 10ms
so the whole issues_page will reduce about 200ms to load