quite the contrary, pjax reduces bandwidth and, properly implemented, reduces total # of requests (since once html, css, js, images are downloaded, you just hit the server for the content that varies; usually the page's main content area and title)

can't get much leaner than that. IE 10 supports pushState(), so the future is looking bright.

I's all-in now, give poor ole' JVM beast a break, it might OOME on me if I actually put it to work...