I run gravity forms in easy fancybox and have a the same form running a few times on the same pages.
All of which was working great.
added w3 total cache and still all working great.
All of the sudden noticed submissions were off, tried the form and it takes forever to submit. Minutes.
Ran all of the tests mentioned in the forums. Knocked out all plugins — only had 4 running anyway, G xml sitemaps, thesis openhook, easy fancybox and W3.
Tried submitting the form within the form preview with all plugins off and it still lagged.
I am hosting with dreamhost and have contacted support to which they have replied all looks normal on their end.
Forms are here with easy fancybox
Here is a standalone form
Exported my form and emailed you my xml file Chris.
I also have moved the file to another install on a different server (same webhost though - dreamhost) and it lagged there as well.
Built a new form and tried that to no avail.
Completely un-installed and re-installed gravity to no avail.