Test it here on many browsers, many connections, and it goves you tips and tricks on how to improve:
http://webpagetest.org
Your host's call center agents - their first and only job is to blame YOU. Keep that in mind.
Here's today's, just ran:
It timed out on Chrome here, your vBShout locked it up:
http://www.webpagetest.org/result/13...3KF/1/details/
Firefox, timed out too:
http://www.webpagetest.org/result/131023_8K_13MZ/
Here's a completed waterfall:
http://www.webpagetest.org/result/13...etails/cached/