复杂的客户端逻辑 - 更好地移动到服务器端？

I'm working with a third-party search API, and am rather enjoying keeping pretty much the entire application on the browser side. The XML is digested entirely with javascript, and I'm rendering complex result objects dynamically, using a javascript templating engine. There are few page reloads happening, and lots of fancy javascript going on. I'm working with a third-party search API, and