Severe performance issues with Custom Sidebars Plugin

Starting on Monday my website became crippled by lag. I ran the P3 Plugin Profiler and it turns out the culprit is the Custom Sidebars Plugin. I run a very large site (www.dmu.edu) with many many sidebars so I thought that was the cause, even after deleting all sidebars the plugin continues to cripple my site. It is only operating now because of W3 Total Cache which is serving static versions of the website.

I also tried upgrading to Custom Sidebars Pro but that had no effect.