2007 Blog Internet Traffic 
Speed Curve
DECEMBER 19, 2018
This blog post has a simple conclusion: Load script asynchronously! Understanding the importance of loading scripts asynchronously might help increase adoption of this critical performance improvement, so we're going to walk through the evolution of async script loading starting way back in 2007.
Adrian Cockcroft
MAY 6, 2023
They state in the blog that this was quick to build, which is the point. Then they tried to scale it to cope with high traffic and discovered that some of the state transitions in their step functions were too frequent, and they had some overly chatty calls between AWS lambda functions and S3.
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