Robert Johnson interviewed at Velocity 2010
summary
Facebook cuts page load roughly in half and explains how: site two times faster comes from pipelining independent UI sections with BigPipe pagelets—server streams partial HTML after sending a header to start JavaScript, letting critical top content render first. Techniques include image spriting, tiny JS/CSS, and rolling best practices into frameworks. Deployment relies on gradual rollout to small user cohorts and automated production monitoring rather than prelaunch checklists, accepting postdeploy detection and quick rollback as the main safety valve.
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