Tencent Architect

May 11, 2026 · Backend Development

How Adding Two Brackets Made a Django API 8× Faster: A Real‑World Performance Debugging Tale

When a high‑traffic Django endpoint that returned a 7 MB JSON payload slowed dramatically, the author traced the bottleneck to a misuse of StreamingHttpResponse that iterated over the response string character‑by‑character, and fixing it with a simple list wrapper or HttpResponse yielded up to an eight‑fold speedup.