No response when clicking on Files tab

If you happen to have a lot of folders and files, especially big size files, this tab will freeze for a long time, I’ve been trying for 3 days, I wait for 4-5 mins each time, there’s no response at all, the page is just keep loading.

Finally I’ve got this page loaded while I’m writing this post, I noticed that there’s a few Gigabytes files in different folders which are already marked as excluded in the previous version of BackWPup.

This is quite frustrating.

http://wordpress.org/extend/plugins/backwpup/