Comment by ANTSANTS

Yes. Asynchronous image loading and rendering is already built into the browser, and the rest of the content shouldn't take long to load to begin with. Fancy dynamic Javascript frameworks that break up what should have been a single response into 20 different responses, asynchronously firing dozens of superfluous repaints as the data trickles in, cause far worse performance, latency, and usability problems than rendering a single chunk of HTML ever did.