Hints and tips
ECMAScript 6 promises are not, at the time of this writing, available on all browsers or JavaScript environments. There are some great shims out there that can add the functionality with a minimum of overhead.
When examining the performance of retrieving JavaScript from a remote server, there are tools provided in most modern browsers to view a timeline of resource loading. This timeline will show when the browser is waiting for scripts to be downloaded and when it is parsing the scripts. Using this timeline allows us to experiment and find the best way to load a script or series of scripts.
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