The Codefol.io logo on a book cover.

Many Ruby Performance posts here are linked to engineering.appfolio.com - I wrote for that site as AppFolio’s Ruby Fellow for many years, and I’m quite happy to link to them.

About Ruby and Rails Performance practically:

About Benchmarking, Profiling and Performance in general:

About Ruby’s (or Rails’) performance historically:

Some Fairly Academic Links (not written/spoken by me):