Inline prompt inspection adds about 525ms TTFB in an LLM proxy gateway
the_liberty · reddit · 2026-07-28
Inline prompt inspection added about 525ms TTFB in production
A Reddit post benchmarks an inline proxy gateway for LLM apps that combines authentication, rate limiting, and prompt-threat inspection in one hop.
Measured latency
- DNS + TLS / cold edge hop: about 230ms
- Total server processing / TTFB: about 525ms
- The author says that server time includes:
- Edge auth and rate limiting
- Inline prompt threat inspection and classification
- Proxy routing
Deployment lesson
- Without --min-instances=1, Cloud Run cold starts could push TTFB to roughly 20 seconds.
- Keeping at least one warm container was described as essential for usable response times.
What the author asks
They want to know what latency budget other teams tolerate before users complain, and how people balance inline inspection versus async logging when deploying prompt-security guardrails.
This is framed as a production question about where to enforce prompt security without making apps feel slow.
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