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Improving Go API request performance
(4rkal.com)
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Goroutines are amazing and extremely easy to use. However, you should absolutely not include them wherever possible. Using them can in fact slow down a program for which they are not suited (context switching still has a cost), and they introduce non-trivial complexity.
Still, it's nice to see a post with some start-here optimization ideas; many Go optimization articles assume a deep experience with Go and can be daunting.