I set out to prove a code-review comment right. The stopwatch had other plans. Code review last week: a progress endpoint for a long import job, returning IAsyncEnumerable<Step> from a minimal API. The comment under it said what I'd have written myself a month ago: "JSON responses buffer, the client won't see anything until the job finishes. Use SignalR." I've repeated that advice for years without once pointing a stopwatch at it. So before approving, I did. The rig O...