[How To?] find out what causes mybb forum slow on my site.

[Ronshaan]

hi...
i m using mybb forum on my site and i try to figure out what cause the site to be slow.
i disactivated some plugins but still..
how can i get the info which plugin is causing the slow site
because when i disabled them all, site was running quicker then b4 but when i activated it back.. it started loading slow, quick reply load takes time.. 
please guide how can i know which plugin is causing slow site.

[Nathan Malcolm]

Simply disable them one by one until you notice a change.