Updated to the new version and had to deactivate the plugin. Load time on our site was over 30 seconds with the plugin. It could be because we have several thousand attached images with several tens of thousands of posts? Our posts meta table has 1,334,013 entries.
I noticed in the code a query using a meta_value in the where clause. I checked and none of our wordpress databases index the meta value column. This could cause many ugly table scans? Maybe it's the cause of the performance problem?
http://www.sparkle-gear.com if you want to take a look.