You've got a custom field in there - that causes SalsaPress to make an additional CURL request to get the HTML for that form - which is not cached (see form.php).
SalsaPress (and the Simple Dom Parser) uses the PHP curl command for most interactions with the server. Maybe there's some sort of setting or resource problem with your host that makes this slow.
Developing site, and we're experiencing extremely slow page load for form at: http://dev.marketingclique.com/texas-aft/salsa-form/
Any clues?