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HAProxy did not produce a universal 206 ms token delay in the cited test. A 2026 benchmark reported that result for HAProxy 3.4.4 forwarding regularly emitted, roughly 60-byte SSE frames; it also found that larger frames behaved differently. The finding describes one workload and setup—not a default experienced by every HAProxy deployment.
What the 206 ms result actually measured
In Remdore’s 2026 first-person benchmark, HAProxy 3.4.4 handled roughly 60-byte frames emitted every 50 ms with a reported time to first token of about 206 ms. The report also recorded a 0.0 ms frame gap and 5.12 frames per client read, indicating that multiple small frames were commonly delivered together in that tested path. These are the benchmark author’s measurements, not official HAProxy statistics. Remdore’s benchmark report
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Time to first token and frames per read describe different things. A delayed first token concerns when the client first sees content; frames per read indicates how many frames arrived together in a client read. A reported zero inter-frame gap is not evidence that the stream was smooth: frames can be grouped into a read even when their observed gaps are effectively zero.
Why small frames may arrive in bursts
Ron Northcutt, who identifies himself as an HAProxy employee but says his post is personal rather than official, offers a possible explanation: “HAProxy isn’t buffering tokens. By default, it asks the kernel to batch response body writes into full packets.” In this account, small writes may be grouped by the operating system’s networking behavior rather than held in an application-level HAProxy buffer. Northcutt’s personal post
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That explanation is plausible, but it was not independently established by the benchmark. The report did not resolve the precise flush trigger, and its author explicitly left that investigation open. It would therefore be inaccurate to claim a confirmed timer or byte threshold—or to describe either as the cause in every installation.
Frame size and emission rate change the result
The benchmark’s own variations show why the 206 ms figure should not be detached from the workload. When the report increased frames from roughly 60 bytes to roughly 1.1 KB, HAProxy’s reported first-token time fell to 53 ms, and frames per read fell to 1.46. The author interpreted the change as consistent with an accumulation or flush effect, but did not establish a threshold: inferred values did not reconcile. Remdore’s benchmark report
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Changing the synthetic emitter’s interval also changed the number of frames received per read in that experiment:
| Emitter interval | Frames per read reported |
|---|---|
| 5 ms | 13.67 |
| 50 ms | 5.12 |
| 200 ms | 2.05 |
These ratios belong to the report’s specific setup; they are not general performance guarantees. Frame size, emission interval, client read behavior, proxy version and configuration all matter when comparing streamed-token delivery. The benchmark’s results cannot identify a universal batching threshold.
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What to make of the suggested HAProxy setting
Northcutt’s personal post points readers toward option http-no-delay. However, Remdore’s benchmark lists testing that option and its cost as future work. The available results therefore do not demonstrate that enabling it fixes a 206 ms delay, how it behaves across workloads, or what trade-offs it might introduce. Treat it as a configuration to investigate in a controlled test, not a proven remedy. Northcutt’s post · Remdore’s benchmark report
The report also found that adding X-Accel-Buffering: no did not materially change its HAProxy result. It describes that header as an nginx convention, not a HAProxy configuration control, so setting it is not supported by this evidence as a way to correct HAProxy token delivery. Remdore’s benchmark report
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Why nginx’s result does not settle the comparison
In the benchmark’s small-payload conditions with a promptly reading client, nginx’s proxy_buffering off setting had no measurable effect. In a separate scenario—with about 328 KB of payload and a client sleeping 200 ms between reads—the report measured 53 ms to first token with buffering on and 3 ms with it off. These are distinct test conditions, not contradictory verdicts: client read behavior and workload can change whether buffering settings matter. Remdore’s benchmark report
The same report describes a limited real-model check: 15 calls to a DigitalOcean serverless inference endpoint, all returning HTTP 200. It recorded 5.43 frames per read for HAProxy and 1.04 for nginx, while cautioning that model timing varies. That comparison does not by itself show that the proxy caused a user-visible delay or establish that one proxy is faster in general. Remdore’s benchmark report
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How to test your own stream fairly
A useful comparison keeps the stream and observation method consistent, then changes one proxy condition at a time. Record enough detail to distinguish delayed first content from frames merely arriving together.
- Record the HAProxy and nginx versions, relevant configuration, host environment, and whether the path includes another proxy or load balancer.
- Use the same emitter for each run. Record frame size and emission interval, and verify that it actually met its intended pacing.
- Use the same client and read behavior for both proxies. Record when the first frame becomes visible, inter-frame gaps, and frames received per read.
- Compare direct and proxied paths under the same conditions. If testing a setting such as
option http-no-delay, change only that setting and repeat the runs. - Test both small and larger frames, and test promptly reading clients separately from clients that pause between reads. Report each condition rather than blending unlike results into one number.
Remdore says its synthetic emitter logged send timestamps and checked pacing before accepting a run, measured the direct path in the same cell, and used raw sockets to avoid client-library buffering. It also reports that macOS with Docker Desktop introduced scheduling and networking artifacts; its published comparisons used a 2-vCPU Ubuntu 24.04 droplet. Those details improve context, but the benchmark remains the author’s account rather than an independently audited reproduction. Remdore’s benchmark report
What the report leaves unresolved
- The exact mechanism and trigger for the observed grouping of small frames.
- Whether
option http-no-delaychanges the result, and any associated cost. - Explicit upstream keepalive configuration for Caddy and Traefik, which the report lists as remaining work.
Until those questions are measured, use the 206 ms figure as a useful signal to test your own path—not as a diagnosis of HAProxy defaults in every deployment.
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