Langda is a lightweight Ruby performance helper that automatically detects loops, counts their iterations, measures execution time, and logs slow loops — all without changing your application code.

It is designed for Rails and Ruby developers who want instant visibility into slow loops such as each, map, select, reject, etc.

• 🟢 Auto-detects common Ruby loop methods
• 🔢 Counts loop iterations
• ⏱ Measures execution time using high-precision monotonic clock
• ⚠ Logs loops that cross the configurable slow threshold
• 🛡 Safe fallback — never crashes your app
• 🚀 Works in Rails, plain Ruby, Sidekiq, and background jobs
• 🔌 Zero configuration — install and use instantly

• [Langda] Array#each → 42 iterations → 12.37 ms at app/models/user.rb:25
• [Langda] Hash#map → 8 iterations → 6.19 ms at app/services/report_builder.rb:12

Add this line to your Gemfile:

gem "langda"