Hey from the GitHub team. Outages like this are incredibly painful and we'll share a post-mortem once our investigation is complete.
It stings to have this happen as we're putting a lot of effort specifically into the core product, growing teams like Actions and increasing performance-focused initiatives on key areas like pull requests where we're already making solid progress[1]. Would love if you would reach out to me in DM around the perf issues you mentioned with diffs.
There's a lot of architecture, scaling, and performance work that we're prioritizing as we work to meet the growing code demand.
We're still investigating today's outage and we'll share a write up on our status page, and in our February Availability Report, with details on root cause and steps we're taking to mitigate moving forward.