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Re:MySQL performance optimization: 50% more work with 60% le... by rastem on Friday June 26, 2015 @05:57PM (#9787998)
This article doesn't talk about the optimizations, it just mentions they were done. Clickbait, I'm afraid.
Re:MySQL performance optimization: 50% more work with 60% le... by dragonne on Friday June 26, 2015 @06:36PM (#9788159)
The link at the end points to this slide deck, which has more specific details: http://www.slideshare.net/denshikarasu/all-your-iops-are-bel...

I recommend taking a look at it.