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Lots of good resources linked from this site by Daniele Bartolini: Data Oriented Design Resources
Data-Oriented Design book (2018 version)- html with links
Data-Oriented Design book (2018 version) - PDF download (better images)
Data-Oriented Design book - 2018 paperback version (with extra chapters)
Data-Oriented Design book (2018 version)- html with links
Data-Oriented Design book (2018 version) - PDF download (better images)
I came across this article on writing a really really fast json parser here
There are a few links in there that take you on a great tour of optimisations if you can spare the time to follow them, including a lovely post about 50% improvement in speed in SQLITE.