I was experiencing the site slow down that others have reported. I applied the fixes listed by other members here: http://wordpress.org/support/topic/plugin-media-library-categories-40-performance-hit?replies=6
This did in fact speed the site back up. However, the next time I logged into my admin dashboard the site was slow again and the plugin duplicated itself. Meaning, the plugin is listed twice in the plugin dashboard.
I deleted both plugins and reinstalled. The same thing happend again.
Is anyone else experiences this? Does anyone have an idea why this is happening or how I can correct it?