For high performance websites, rocket loader technique is as a rocket science. The websites may have huge amounts of visitors. To serve those visitors without delaying on loading this method does a bit much more effort.
What does rocket loader do?
secondly. The combined file will be compressed removing unwanted space and new lines, this will still enable to reduce size up to 15-30% of the file size.
thirdly, the file will be embedded with adding “async” on the embedding line. for example the embedding will be as
a well explained at Cloud flare