I'm using the latest Dynamix theme from themeva.com. With the standard plugins that come with the theme, adding WP-Types & WP-Views to the site causes extremely slow (25 second+) db queries & prevents the theme options interface from loading (Appearance -> Theme Options)
I have 1 CPT, 1 Taxonomy, about 50 small Views & about 200 items in the CPT.
I increased the WP_MEMORY setting to 64 meg, which helped the speed problem. I also contacted the FaceBook Feed Pro plugin, who provided an update that fixed the conflict with the theme options page. Now everything appears to be working properly.