Review results Offline
If you have a large number of screenshots / diffs and bad internet connection it can be frustrating when the browser downloads images.
For these situations, we have built archives. So you can download all the results as a single archive and then review them fast.
Another idea for using these archives is to use them as artifacts for your build server. So whenever diffs are found your users would not need to login to Diffy and see results there. Instead, they would have a link to an artifact to review everything they need. This is the way to whitelabel Diffy too.