Performance Impact of Using Ruby on Rails View Partials
Never treat the DRY philosophy as the ultimate tool for the well-written codebase. Its better to repeat yourself than to ship an app with mediocre performance. Always measure the performance impact of various programming patterns using performance monitoring tools.
Source: Performance Impact of Using Ruby on Rails View Partials - Scout APM Blog
So partials are slower than they should be… That means we should invest in speeding them up.