We've just started using New Relic to monitor our D6 sites, and are also taking advantage of New Relic's ability to report on Drupal module performance.
Our sites contain several modules with configuration exports that are controlled by Features (views, content types, etc).
New Relic's module performance page shows features.module as being the slowest and as having the highest function call count.
It was my understanding that Features doesn't do too much of anything except for when you are creating/updating/reverting your features, so I'm confused as to why New Relic would report it as being such a drag in terms of site performance.
Can anyone confirm that Features does indeed significantly impact site performance? Or confirm that it doesn't (in which case this seems like a New Relic issue).