Between deprecation warnings, gem compatibility checks, and the inevitable late-night debugging session, the process can feel like a lot of effort for an uncertain payoff. Having recently taken a mid-sized Rails application from version 7 to version 8, I wanted to share what actually changed on the performance side, because the gains were more concrete than we expected. Faster Boot Times One of the first things I noticed was a noticeably quicker boot process, both in development ...