I'm an existing DH customer. Our site was on shared hosting and became more and more sluggish. I moved it to a VPS and it was better, but it got much better once I turned on PHP Caching. The amount of VPS memory which I allocated to the site did not impact performance.
Despite all that, my Museum Director was determined that we needed to move the hosting of the site to a different provider. He likes to listen to people who tell him what he wants to hear. Much to my disappointment, the VPS install at new host is loading site pages in half the time which I was getting at DH.
Sure, I wish I could say "I told you so" to my director, but my real concern is to know how I could have known to expect such an outcome. I'm not aware of any publicly available info that would have allowed me to compare the speed of the two VPS environments. Since I still have access to both environments, does anyone know of any tools that I could run which would point out speed differences?