From latency to instant: Modernizing GitHub Issues navigation performance

When you’re working through a backlog—opening an issue, jumping to a linked thread, then back to the list—latency isn’t just a metric. Even small delays add up, and they hit hardest at the exact moments developers are trying to stay in flow. It’s not that GitHub Issues was “slow” in isolation; it’s that too many navigations still paid the cost of redundant data fetching, breaking flow again and again.