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gates / gates (push) Successful in 28s
Third and last leg, found the same way as the second — by not accepting that the numbers matched the arithmetic when they did not. After the fan-out and the side-by-side resolve the page was ~11.9s mean where ~3s was predicted. Cause: the client used http.DefaultTransport, whose MaxIdleConnsPerHost is 2. Above that Go opens a connection per request and discards it after, so under a 16-way fan-out almost every call paid a fresh TCP setup AND a fresh authentication. Authentication is the expensive half: unauthenticated /api/v1/version answers in ~0.03s while an authenticated package call takes ~0.24s against the same Gitea instance. Transport sized to the fan-out: MaxIdleConnsPerHost 16, MaxConnsPerHost 16 as a ceiling so a large package list can never stampede Gitea harder than the fan-out needs, IdleConnTimeout 90s.