Ruby Performance Optimization

Guide to profiling, benchmarking, and optimizing Ruby code.

Profiling First

Always measure before optimizing. Identify bottlenecks with profiling tools.

benchmark-ips

Compare implementations with statistical significance:

require "benchmark/ips"

Benchmark.ips do |x|
  x.report("map + flatten") do
    [[1, 2], [3, 4]].map { |a| a * 2 }.flatten
  end