Why is my Symfony site so slow? Can someone decipher this pingdom?

my site is really really slow, 4603prospect.com? Sometimes its ok, sometimes开发者_Python百科 its slow. I am caching thumbnails, I dont understand what to make of this pingdom report.... http://tools.pingdom.com/?url=4603prospect.com&treeview=0&column=objectID&order=1&type=0&save=false

Thanks Todd

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Things that might help to check:

• Are you using shared hosting? Your server may be responding slowly due to the activity on other websites on the server
• Are your images falling foul of an htaccess rule which results in redirects?
• How many images are you loading at once? Most browsers can only make ~8 http requests at a time. You could try combining some of your CSS and JS files together to limit the HTTP requests.