Also caching. In terms of parallelisation, this method is only beneficial if there is currently request queuing, same principle as using sprites - https://devel

Also caching. In terms of parallelisation, this method is only beneficial if there is currently request queuing, same principle as using sprites - https://developers.google.com/speed/docs/best-practices/rtt#SpriteImages https://developers.google.com/speed/docs/best-practices/rtt#...