Banzai::Filter::RelativeLinkFilter is slow
As per http://performance.gitlab.net/dashboard/db/markdown-filter-methods?var-process_type=rails&var-method=Banzai%3A%3AFilter%3A%3ARelativeLinkFilter%23call processing relative links is quite slow, varying between 100 and 2 seconds. Quickly looking at the code it all looks rather complex so I wouldn't be surprised if this ends up running queries, access Git, etc.