Improve forum rendering speed

Log in as admin Create a site with 2 users (ensure both users have profile images set) Create a course with a forum and discussion Enrol the 2 users in the course Enable portfolios on the site (Site administration > advanced features > enable portfolios) Enable and make visible the file download portolio plugin (site administration > plugins > portfolio > manage porfolios) Log in as user 1 and post in the discussion and add a text file as an attachment to the post Log in as user 2 and post the following text in the discussion: When $a \ne 0$, there are two solutions to (ax^2 + bx + c = 0) and they are $$x = {-b \pm \sqrt {b^2-4ac} \over 2a}.$$ Log in as admin View the discussion CONFIRM that the posts have the author's profile image rendered CONFIRM that you can export the attachment posted by user 1 (click the plus icon next to the attachment) and/or the post CONFIRM that the post from user 2 has had the mathjax text filtered to show the equations (easiest way to confirm this would be to post the same text in a different Moodle install forum without these changes and confirm that it looks the same)