scriptloader

preload script while execute in order, when DOMContentLoaded is called.

The test under web folder ( 20 requests, 533kB resources ) contains test with scriptloader and synchronous tags. Their results:

• tag: DOMContentLoaded ~ Load. ( 670ms )
• tag with defer: similar to tag.
• scriptloader: DOMContentLoaded (588ms) faster than Load by ~ 80ms (666ms)

where

• DOMContentLoaded: DOM is ready, so the handler can lookup DOM nodes.
• Load: external resources are loaded, so styles are applied, image sizes are known etc.

Discuss

• scriptloader is faster in DOMConentLoaded, because it defers script executing after DOMContentLoaded.
• scriptloader may be used to control cache of js files.