I love this plugin but lately I had to turn it off because of performance. I have a site with over 45k unique visitors a day and over 100k pages viewed daily.
The plugin is set to show 12 thumbs with "tags" as the relationship. My server load shot up to an average 15.00 compared to 1.3.
I think W3 Total Cache is not chaching the related thumbs hence my server load.
Is there a way to check if the related thumbnails are being cached?