This is a screenshot from our New Relic RPM performance analysis.
The CoversController uses Paperclip for file attachments, while the ImagesController uses Attachment-Fu.
While these results don’t strike me as particularly surprising, they’re certainly compelling.
Switching to Paperclip was a decision I made for Covers due to some slightly unusual requirements, but I decided to leave Attachment-Fu in place for Images in order to see (completely informally and unscientifically) how they stacked up against each other in production. Both Covers and Images use ImageMagick for image processing and Amazon S3 for file storage.
