I made a simple contact form for the footer of a website, nothing fancy - just verifies a valid email address, filters out any messages with URLS, and then passes it off to php's mail() function.
When I first set it up, it worked great - sends immediately. In the last few months I've been noticing a problem where it will take 60 seconds to work. It will still work, but it will take 60 seconds.
I added some debugging and the "thank you for contacting us" page will take 60.0000xxx seconds to load when this problem happens.
FWIW, My site is running PHP 5.3.x FastCGI with Extra Security enabled and you can test it out at http://therevox.com