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Challenge
Ruby & Rails Ruby
Profiling
https://blog.sentry.io/profiling-101-what-is-profiling/
https://ruby-prof.github.io/
https://github.com/MiniProfiler/rack-mini-profiler
https://rbspy.github.io/
https://medium.com/motive-eng/we-solved-our-rails-memory-leaks-with-jemalloc-5c3711326456
https://engineering.binti.com/jemalloc-with-ruby-and-docker/
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