I manage a shop that runs on CE 1.5.*. And gets lot of drop offs in checkout pages. Checkout page takes a lot of time to load. I run on multiple servers with 7.5 G of RAM with a php memory limit of 3.5 G.
So thinking of moving my checkouts to a separate server of little bit more resources may be a 32 G RAM. and more CPU capacity. Planning to redirect all requests to URL ~checkout/onepage/ to a separate server.
Is this is something achievable with Magento. My customer sessions are in a separate Mongo server