As anyone who reads my blog posts will notice, I'm not a big fan of Magento. Traditionally it's been crazy slow, upgrades are a nightmare, and its system requirements are outrageous.
But, I'm proud to say that I've actually got a Magento site running extremely fast. Checkout BB Organ. Thanks to NGINX, FreeBSD, and a well configured database it's the fastest loading Magento site I've seen, coming up in just over 1.5 seconds.