Ruby has become a crucial component in modern web development, significantly impacting application development, testing, and CI/CD workflows. A study using data from continuous profiling of over 3,000 services reveals that Ruby applications are compute-intensive, often spending around 82% of their CPU time in library code, highlighting the importance of selecting efficient libraries. Notably, libraries like stdlib, activerecord, and activesupport are major contributors to CPU usage, with limited alternatives available. However, some libraries, such as mysql2, can be replaced for better performance, and others like pg and modern versions of json are both popular and resource-efficient. While web server choice does not significantly affect CPU consumption, upgrading to Ruby 3 can result in lower library CPU usage compared to Ruby 2, and Ruby 3.5 is anticipated to offer further performance enhancements. Despite these improvements, garbage collection remains a consistent CPU overhead across Ruby versions. The findings emphasize the importance of strategic library choices and version upgrades to optimize Ruby performance.