by Richard Collecutt.
Hi, I have this problem when backing up large courses using Internet Explorer (8 and 9) - it simply cannot handle displaying large pages with lots of content, especially checkboxes that use ajax or javascript. It also happens when editing a large course as well.
The fact that selecting or deselecting objects on the browser takes a long time indicates the problem is with the browser, not the server.
The solution I use is to change my web browser to something like Google Chrome, it does not slow down very much when displaying a large course for editing or for backup.