[jramsay]

> it's unusable for large changes and large files. On large changes it sometimes won't even show all the changes.

Improving the performance and scalability of merge requests is the priority for the Source Code team right now, and we are starting with progressively loading the diffs over coming releases. See https://gitlab.com/groups/gitlab-org/-/epics/1816. Currently we load them in a single request which is a serious bottleneck.

In parallel we are exploring a range of UX changes to streamline and improve the code review experience. If you have any specific ideas please let us know, or create an issue!

> Also, merge trains for FF-only repos, please!

Absolutely! We are iterating towards this https://gitlab.com/gitlab-org/gitlab-ce/issues/58226!