Achieving Fast Method Metaprogramming: Lessons from MemoWise by Jemma Issroff, Jacob Evelyn Are dynamically generated methods always slow? In this talk, we’ll recount our journey developing MemoWise, Ruby’s most performant memoization gem. It’s a tale of benchmark-driven development, unexpected object allocations, and learning to love eval. We’ll cover common performance problems in Ruby metaprogramming and the arcane techniques we used to overcome them.