Performance

Titanium targets low-overhead MITM proxying: connection pooling, HTTP/2 multiplexing, and buffer reuse. Numbers below are Release measurements with RpsLoadProbe (and BenchmarkDotNet / Basic example where noted). Absolute RPS varies by hardware, OS, and background load — compare within a table, not across Windows vs Linux.

Control arms: nginx (native C reverse-proxy ceiling; Linux is authoritative) and YARP (Yarp.ReverseProxy, managed .NET reverse proxy). Neither can MITM (no CONNECT / forged certs). FiddlerCore is not compared (commercial debugger license; not a throughput peer).

For pooling knobs and certificate first-visit tuning, see Performance and pooling. For the methodology behind these numbers — the harness, noise control, and the profiling techniques used to find each hotspot — see Performance Profiling.

Measurement environment

Windows (developer laptop)


OS	Windows 11 (10.0.26200)
CPU	11th Gen Intel Core i7-1185G7 @ 3.00 GHz (8 logical processors)
RAM	31.8 GiB
Runtime	.NET 10.0.10
nginx	nginx/Windows 1.31.3
YARP	Yarp.ReverseProxy 2.3.0
Harness	RpsLoadProbe Release; arms run sequentially

Linux (GitHub-hosted `ubuntu-latest`)


OS	Ubuntu 24.04.4 LTS
CPU	AMD EPYC 7763 (4 logical processors on the VM)
RAM	15.6 GiB
Runtime	.NET 10.0.11
nginx	nginx/1.24.0 (Ubuntu)
YARP	Yarp.ReverseProxy 2.3.0
Harness	RpsLoadProbe Release; median of 3 repeats where noted

How to read the tables

Mode: Reverse = transparent fixed-forward (may TLS-terminate to a cleartext origin, or re-encrypt to a configured HTTPS/QUIC origin). MITM = proxy decrypts the client crypto and speaks TLS/QUIC to the origin (or explicit decrypt proxy), so both legs are visible in the clear inside TWP. nginx and YARP cannot do MITM.
Sustainable = last concurrency that still met error/latency SLOs. Peak = highest RPS in that ramp.
Winner = highest sustainable RPS among products that have a number on that row. Left blank when only TWP can run the path (no fair multi-product comparison).
Not possible = product cannot do that path. Not measured = path exists but no published number yet for that OS.

pwsh tools/RpsLoadProbe/run-rps.ps1 -Mode compare-same
pwsh tools/RpsLoadProbe/run-rps.ps1 -Mode compare-terminate
pwsh tools/RpsLoadProbe/run-rps.ps1 -Mode compare-bridges
pwsh tools/RpsLoadProbe/run-rps.ps1 -Mode compare-mitm
pwsh tools/RpsLoadProbe/run-rps.ps1 -Mode compare-bodies
pwsh tools/RpsLoadProbe/run-rps.ps1 -Mode compare-post
pwsh tools/RpsLoadProbe/run-rps.ps1 -Mode compare-lossy
pwsh tools/RpsLoadProbe/run-rps.ps1 -Mode compare-tls-cost

Windows — Titanium vs nginx vs YARP

Client / origin: HTTP version and whether TLS is used (plain = cleartext, TLS = encrypted, QUIC = HTTP/3).

Mode	Client	Origin	TWP sustain	TWP peak	nginx sustain	nginx peak	YARP sustain	YARP peak	Winner
Reverse	HTTP/1 · plain	HTTP/1 · plain	24,153	34,576	14,882	14,882	29,939	29,939	YARP
Reverse	HTTP/1 · TLS	HTTP/1 · plain	22,985	22,985	11,173	11,173	25,822	25,822	YARP
MITM	HTTP/1 · TLS	HTTP/1 · TLS	31,479	31,479	Not possible (no MITM)	Not possible	Not possible (no MITM)	Not possible
Reverse	HTTP/2 · TLS	HTTP/1 · plain	29,134	29,134	4,755	10,796	27,669	27,669	TWP
MITM	HTTP/2 · TLS	HTTP/1 · TLS	35,673	35,823	Not possible (no MITM)	Not possible	Not possible (no MITM)	Not possible
MITM	HTTP/2 · TLS	HTTP/2 · TLS	51,455	51,455	Not possible (no MITM)	Not possible	Not possible (no MITM)	Not possible
Reverse	HTTP/2 · TLS	HTTP/2 · plain	88,742	88,742	Not possible	Not possible	68,761	68,761	TWP
Reverse	HTTP/2 · plain	HTTP/1 · plain	23,228	23,228	Not possible	Not possible	27,697	27,697	YARP
Reverse	HTTP/2 · plain	HTTP/2 · plain	102,819	102,819	Not possible	Not possible	85,909	85,909	TWP
Reverse	HTTP/2 · plain	HTTP/2 · TLS	27,943	27,943	Not possible	Not possible	49,202	49,202	YARP
Reverse	HTTP/2 · plain	HTTP/3 · QUIC	12,036	12,036	Not possible (no QUIC)	Not possible	14,817	14,817	YARP
Reverse	HTTP/3 · QUIC	HTTP/1 · plain	12,392	12,850	Not possible (no QUIC)	Not possible	14,181	17,238	YARP
Reverse	HTTP/3 · QUIC	HTTP/2 · TLS	33,198	33,198	Not possible (no QUIC)	Not possible	39,963	39,963	YARP
MITM	HTTP/3 · QUIC	HTTP/1 · TLS	9,732	10,334	Not possible (no QUIC)	Not possible	Not possible (no MITM)	Not possible
MITM	HTTP/3 · QUIC	HTTP/2 · TLS	3,527	3,527	Not possible (no QUIC)	Not possible	Not possible (no MITM)	Not possible
MITM	HTTP/3 · QUIC	HTTP/3 · QUIC	10,810	10,810	Not possible (no QUIC)	Not possible	Not possible (no MITM)	Not possible
Reverse	HTTP/1 · TLS	HTTP/2 · TLS	38,540	38,540	Not possible	Not possible	45,227	45,227	YARP
Reverse	HTTP/1 · TLS	HTTP/3 · QUIC	14,053	14,053	Not possible (no QUIC)	Not possible	17,350	17,350	YARP
Reverse	HTTP/2 · TLS	HTTP/3 · QUIC	17,141	17,141	Not possible (no QUIC)	Not possible	13,473	13,473	TWP

Windows sources: matched-client cool pairs under tools/RpsLoadProbe/results/matched-baseline/ and matched-post-fix/ / matched-post-headers-writer/ (2026-08-18), HttpClient H3 cool pairs under matched-httpclient-h3/ (2026-08-18), plus 2026-08-19 High-perf cool pairs under residual-sub08/quiet-remeasure/ (h3-lite-only/, h2c-iocp-min/, h2c-wu-batch-confirm/). Warmup 2–8s; measure 5–30s; concurrency 8–64. Absolute RPS swings with sequential-arm heat; prefer TWP÷YARP ratios over absolutes.

Load generators: Reverse inbound H3 arms (H3→H1, H3→H2) use dotnet-httpclient (http_version=3.0, RequestVersionExact) on both TWP and YARP after dual-listen reverse H3. UDP-only MITM H3 still uses quic-http3. Older reverse-H3 ratios that used matched quic-http3 are not comparable to these HttpClient numbers.

Matched HttpClient TWP÷YARP (cool): H3→H1 ≈ 0.87 sustain (12,392 / 14,181). H3→H2 ≈ 0.83 (33,198 / 39,963; ≥0.80) — session-less H3→H2 reverse (h3-lite-only/). H1→H2 ≈ 0.85 (38,540 / 45,227; ≥0.80). H2 TLS→h2c ≈ 1.29× (88,742 / 68,761; TWP leads) — post-wu-batch-arms/. h2c→h2c ≈ 1.20× (102,819 / 85,909; TWP leads) — h2c-wu-batch-confirm/.

nginx/Windows is a limited port — use it for same-OS comparison only, not as the industry nginx baseline.

H2 TLS → H1 plain on Windows: fair terminate — TWP leads sustain (~1.05× YARP) in the current table. Absolute RPS swings with background load; treat as same-OS only.

Linux — Titanium vs nginx vs YARP

Median of 3 repeats from Actions runs 32057531323 (compare-same), 32057536434 (compare-terminate), 32057541322 (compare-bridges). Warmup 2s / measure 8s; concurrency 8, 16, 32, 64. Linux nginx is the authoritative nginx baseline. The RPS workflow installs libmsquic (QuicListener.IsSupported=true on ubuntu-latest).

TWP÷nginx H1 plain reverse ≈ 0.67; TWP÷YARP H1 plain ≈ 0.95. Prefer ratios over absolute RPS on GHA VMs.

Mode	Client	Origin	TWP sustain	TWP peak	nginx sustain	nginx peak	YARP sustain	YARP peak	Winner
Reverse	HTTP/1 · plain	HTTP/1 · plain	26,499	26,499	39,440	39,440	27,784	27,784	nginx
Reverse	HTTP/1 · TLS	HTTP/1 · plain	18,863	18,863	27,696	27,696	20,270	20,270	nginx
MITM	HTTP/1 · TLS	HTTP/1 · TLS	15,631	15,631	Not possible (no MITM)	Not possible	Not possible (no MITM)	Not possible
Reverse	HTTP/2 · TLS	HTTP/1 · plain	11,420	11,489	13,543	19,093	29,784	29,784	YARP
MITM	HTTP/2 · TLS	HTTP/1 · TLS	10,787	10,787	Not possible (no MITM)	Not possible	Not possible (no MITM)	Not possible
MITM	HTTP/2 · TLS	HTTP/2 · TLS	5,189	5,189	Not possible (no MITM)	Not possible	Not possible (no MITM)	Not possible
Reverse	HTTP/2 · TLS	HTTP/2 · plain	7,487	7,487	Not possible	Not possible	45,479	45,479	YARP
Reverse	HTTP/2 · plain	HTTP/1 · plain	16,791	16,791	Not possible	Not possible	35,502	35,502	YARP
Reverse	HTTP/2 · plain	HTTP/2 · plain	7,861	7,917	Not possible	Not possible	48,560	48,560	YARP
Reverse	HTTP/2 · plain	HTTP/2 · TLS	5,731	5,731	Not possible	Not possible	40,314	40,314	YARP
Reverse	HTTP/2 · plain	HTTP/3 · QUIC	13,587	13,587	Not possible (no QUIC)	Not possible	20,553	20,553	YARP
Reverse	HTTP/3 · QUIC	HTTP/1 · plain	13,545	13,545	Not possible (no QUIC)	Not possible	19,686	19,686	YARP
MITM	HTTP/3 · QUIC	HTTP/1 · TLS	12,076	12,076	Not possible (no QUIC)	Not possible	Not possible (no MITM)	Not possible
MITM	HTTP/3 · QUIC	HTTP/2 · TLS	2,187	6,265	Not possible (no QUIC)	Not possible	Not possible (no MITM)	Not possible
MITM	HTTP/3 · QUIC	HTTP/3 · QUIC	9,884	9,884	Not possible (no QUIC)	Not possible	Not possible (no MITM)	Not possible
Reverse	HTTP/1 · TLS	HTTP/2 · TLS	12,681	12,681	Not possible	Not possible	28,423	28,423	YARP
Reverse	HTTP/1 · TLS	HTTP/3 · QUIC	15,104	15,104	Not possible (no QUIC)	Not possible	16,151	16,151	YARP
Reverse	HTTP/2 · TLS	HTTP/3 · QUIC	10,593	10,593	Not possible (no QUIC)	Not possible	21,171	21,171	YARP

On this GHA shape, TWP H1 plain ÷ nginx H1 plain ≈ 0.67 (26,499 / 39,440). H1 TLS terminate ≈ 0.68 (18,863 / 27,696). TWP÷YARP H1 plain ≈ 0.95. Absolute RPS swings by VM; prefer the ratio and median across repeats. MITM H2→H1 / H3→H1 dual-crypto cells reuse prior compare-mitm numbers (not re-run this pass).

Tiny JSON reverse is nginx’s best case on Linux

The tables above use ~64 B keep-alive GET on loopback. On Linux H1 reverse, nginx leads; YARP sits near TWP. Heavier bodies, POSTs, TLS handshake cost, and lossy/HOL workloads (below) change the picture. MITM and many H3/h2c/bridge rows remain TWP-only or TWP+YARP (nginx cannot MITM or speak QUIC in this harness).

Why isn’t HTTP/3 > HTTP/2 > HTTP/1 in raw RPS?

For tiny JSON responses (~64 B) on loopback, that ordering is not expected: topology (TLS hop count, terminate vs MITM) dominates; HTTP/2 and HTTP/3 help multiplexing, not single-origin tiny-GET RPS. See the lossy tables below for a workload where protocol design matters.

Heavier reverse workloads

Separate from the tiny-GET matrix. Same measurement environments. Modes: compare-bodies, compare-post, compare-lossy, compare-tls-cost in RpsLoadProbe. PUT with the same body is the same proxy work as POST; DELETE with no body matches GET — only POST is published.

Lossy link = userspace shim (not kernel netem): TCP gets per-buffer delay + occasional whole-connection stalls (honest HOL for multiplexed H2); UDP datagram drop exists in the harness but H3 lossy is not published — rechecked at concurrency 8 after H2/H3 streaming work (rps-ramp-20260817-212421): TWP H3 through the UDP shim stayed at 0 sustain (multi-second p99); YARP H3 via the TCP shim also failed to establish. Treat as a measurement limitation (MsQuic + lossy shim), not a capability claim.

Windows — heavier reverse GET (64 KiB / 256 KiB)

Warmup 1s / measure 3s; concurrency 8–64. Source: local compare-bodies (rps-ramp-20260817-190233).

Body	Client	Origin	TWP sustain	TWP peak	nginx sustain	nginx peak	YARP sustain	YARP peak	Winner
64 KiB	HTTP/1 · TLS	HTTP/1 · plain	6,146	6,146	447	630	5,623	5,623	TWP
64 KiB	HTTP/2 · TLS	HTTP/1 · plain	1,974	2,152	299	387	2,597	3,982	YARP
64 KiB	HTTP/3 · QUIC	HTTP/1 · plain	866	1,950	Not possible (no QUIC)	Not possible	1,451	1,451	YARP
256 KiB	HTTP/1 · TLS	HTTP/1 · plain	2,100	2,100	214	214	2,318	2,318	YARP
256 KiB	HTTP/2 · TLS	HTTP/1 · plain	688	688	177	177	1,380	1,380	YARP
256 KiB	HTTP/3 · QUIC	HTTP/1 · plain	656	748	Not possible (no QUIC)	Not possible	402	544	TWP

nginx/Windows collapses on large reverse bodies in this harness; treat as same-OS only.

Linux — heavier reverse GET (64 KiB / 256 KiB)

Median of 3 repeats. Source: Actions 32057545720 (compare-bodies). Warmup 2s / measure 8s.

Body	Client	Origin	TWP sustain	TWP peak	nginx sustain	nginx peak	YARP sustain	YARP peak	Winner
64 KiB	HTTP/1 · TLS	HTTP/1 · plain	7,016	7,016	8,791	8,862	7,000	7,120	nginx
64 KiB	HTTP/2 · TLS	HTTP/1 · plain	4,074	4,074	3,937	3,937	5,262	5,262	YARP
64 KiB	HTTP/3 · QUIC	HTTP/1 · plain	3,648	3,648	Not possible (no QUIC)	Not possible	4,616	4,616	YARP
256 KiB	HTTP/1 · TLS	HTTP/1 · plain	2,178	2,178	2,764	2,764	2,255	2,255	nginx
256 KiB	HTTP/2 · TLS	HTTP/1 · plain	1,062	1,062	0	3	1,454	1,472	YARP
256 KiB	HTTP/3 · QUIC	HTTP/1 · plain	1,106	1,106	Not possible (no QUIC)	Not possible	1,304	1,326	YARP

On Linux H1 TLS, TWP÷nginx ≈ 0.80 at 64 KiB and ≈ 0.79 at 256 KiB — better than the tiny-GET ≈0.67 ratio, but nginx still leads sustain when both stay healthy. nginx H2 at 256 KiB failed this harness (~100% errors); TWP and YARP H2/H3 completed.

Windows — POST 64 KiB request + 64 KiB response

Source: local compare-post (rps-ramp-20260818-064426; warmup 2s; measure 5s; concurrency 8–64).

Client	Origin	TWP sustain	TWP peak	nginx sustain	nginx peak	YARP sustain	YARP peak	Winner
HTTP/1 · TLS	HTTP/1 · plain	3,348	3,583	259	296	3,100	3,100	TWP
HTTP/2 · TLS	HTTP/1 · plain	2,062	2,062	255	281	2,384	2,439	YARP
HTTP/3 · QUIC	HTTP/1 · plain	1,346	1,346	Not possible	Not possible	1,024	1,058	TWP

TWP wins the H1 and H3 POST arms and sits at ~0.87 of YARP sustain on H2 POST.

Linux — POST 64 KiB request + 64 KiB response

Median of 3 repeats. Source: Actions 32059387716 (compare-post).

Client	Origin	TWP sustain	TWP peak	nginx sustain	nginx peak	YARP sustain	YARP peak	Winner
HTTP/1 · TLS	HTTP/1 · plain	3,733	3,733	0	0	3,082	3,082	TWP
HTTP/2 · TLS	HTTP/1 · plain	95	275	0	0	2,526	2,526	YARP
HTTP/3 · QUIC	HTTP/1 · plain	0	0	Not possible	Not possible	2,550	2,550	YARP

Linux nginx returned 100% errors on 64 KiB POST in this harness (Windows nginx did complete). Prefer TWP/YARP H1 POST as working reverse paths; do not read the nginx zero as a fair peak contest until the nginx POST arm is healthy on Ubuntu.

Windows — lossy / high-RTT (H2 HOL)

Userspace 5 ms one-way delay + 1% connection stall; 64 KiB GET. Source: local compare-lossy (rps-ramp-20260817-190954).

Client	Origin	TWP sustain	TWP peak	nginx sustain	nginx peak	YARP sustain	YARP peak	Winner
HTTP/1 · TLS	HTTP/1 · plain	637	637	375	375	634	634	TWP
HTTP/2 · TLS	HTTP/1 · plain	14	14	11	13	12	13	TWP

H1 scales with concurrency; H2 collapses under connection stalls (HOL). Absolute RPS is low because the shim delays every buffer — the point is the protocol shape, not competing with the tiny-GET table.

Linux — lossy / high-RTT (H2 HOL)

Median of 3 repeats. Source: Actions 32057553398 (compare-lossy).

Client	Origin	TWP sustain	TWP peak	nginx sustain	nginx peak	YARP sustain	YARP peak	Winner
HTTP/1 · TLS	HTTP/1 · plain	1,114	1,114	1,211	1,211	1,195	1,195	nginx
HTTP/2 · TLS	HTTP/1 · plain	40	45	44	45	40	42	nginx

Same story as Windows: H1 stays usable; H2 falls to tens of RPS for all three products. Tiny-GET H1 leadership does not carry over.

TLS termination cost (H1 TLS → cleartext origin)

Isolates keep-alive tiny GET vs new connection per request (handshake-dominated) vs keep-alive 256 KiB. Product comparison uses RPS and end-to-end latency; TWP can also capture ClientTlsTiming when TWP_RPS_CAPTURE_TLS=1 (child process) — nginx/YARP have no equivalent hook.

Windows

Source: local compare-tls-cost (rps-ramp-20260817-191143).

Workload	TWP sustain	TWP peak	nginx sustain	nginx peak	YARP sustain	YARP peak	Winner
Keep-alive · tiny GET	13,007	14,868	4,863	7,286	17,105	17,105	YARP
New-connection · tiny GET	484	484	380	409	555	555	YARP
Keep-alive · 256 KiB GET	1,651	1,772	171	171	2,038	2,038	YARP

Linux

Median of 3 repeats. Source: Actions 32057558279 (compare-tls-cost).

Workload	TWP sustain	TWP peak	nginx sustain	nginx peak	YARP sustain	YARP peak	Winner
Keep-alive · tiny GET	19,682	19,682	27,711	27,711	21,165	21,165	nginx
New-connection · tiny GET	1,150	1,161	1,020	1,020	981	981	TWP
Keep-alive · 256 KiB GET	2,155	2,155	2,674	2,674	2,197	2,197	nginx

Verdict (Linux, authoritative nginx): On keep-alive tiny terminate, TWP is ~0.71× nginx and ~0.93× YARP. On new-connection terminate, TWP is ahead of both (~1.13× nginx, ~1.17× YARP). With 256 KiB bodies, nginx still leads sustain when all three are healthy.

Other measurements

What	Result
HTTPS TTFB vs direct (median, 14 hosts)	Cold ≈ parity (−1 ms); warm −25 ms (proxy faster)
HTTP/1 loopback GET (no body intercept)	~186 µs, ~17.5 KB allocated / request
Basic example footprint (Release, after load)	~74 MB working set · ~24–29 MB private bytes

dotnet run -c Release --project benchmarks/Titanium.Web.Proxy.Benchmarks -- --filter '*Throughput*'

Benchmark	Setup	Mean	Allocated / op
HTTP/1 GET through proxy	Passthrough	186 µs	17.5 KB
HTTP/2 multiplexed GETs	10 concurrent streams	3.0 ms / batch	~14 KB / request

Raising limits on large hosts

There is no artificial upper clamp on server defaults. Per-endpoint overrides:

Knob	Scope	Default	Override
`ProxyServer.MaxCachedConnections`	process, per upstream host	128	any ≥ 1
`ProxyEndPoint.MaxCachedConnections`	endpoint → pool depth for that EP’s sessions	null (use server)	e.g. `256` on reverse EP
`ProxyEndPoint.MaxConcurrentClients`	endpoint admission	null (off)	any ≥ 1
`ResourceLimits.MaxConcurrentStreamsPerConnection`	H2 streams	256	`ProxyResourceLimits.Create(...)`
`TransparentQuicProxyEndPoint.MaxInboundBidirectionalStreams`	H3	100 (probe uses 256)	property on EP
`ForwardCleartext`	transparent TLS terminate	false	`true` + decrypt

proxy.MaxCachedConnections = 512;
proxy.ResourceLimits = ProxyResourceLimits.Create(
    /* … */,
    maxConcurrentStreamsPerConnection: 1000,
    maxCachedConnectionsPerHost: 512,
    /* … */);

var ep = new TransparentProxyEndPoint(IPAddress.Any, 443, decryptSsl: true)
{
    ForwardHost = "127.0.0.1",
    ForwardPort = 8080,
    ForwardCleartext = true,
    MaxCachedConnections = 256,
    GenericCertificateName = "example.com"
};
ep.BeforeSslAuthenticate += (_, a) =>
{
    a.UpstreamHttpProtocol = UpstreamHttpProtocol.Http11;
    a.AllowHttpProtocolTranslation = true; // HTTP/2 client → HTTP/1 origin
    return Task.CompletedTask;
};

Navigation Menu

Repository navigation

Performance

Performance

Measurement environment

Windows (developer laptop)

Linux (GitHub-hosted `ubuntu-latest`)

Windows — Titanium vs nginx vs YARP

Linux — Titanium vs nginx vs YARP

Tiny JSON reverse is nginx’s best case on Linux

Why isn’t HTTP/3 > HTTP/2 > HTTP/1 in raw RPS?

Heavier reverse workloads

Windows — heavier reverse GET (64 KiB / 256 KiB)

Linux — heavier reverse GET (64 KiB / 256 KiB)

Windows — POST 64 KiB request + 64 KiB response

Linux — POST 64 KiB request + 64 KiB response

Windows — lossy / high-RTT (H2 HOL)

Linux — lossy / high-RTT (H2 HOL)

TLS termination cost (H1 TLS → cleartext origin)

Windows

Linux

Other measurements

Raising limits on large hosts

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Clone this wiki locally

Performance

Performance

Measurement environment

Windows (developer laptop)

Linux (GitHub-hosted ubuntu-latest)

Windows — Titanium vs nginx vs YARP

Linux — Titanium vs nginx vs YARP

Tiny JSON reverse is nginx’s best case on Linux

Why isn’t HTTP/3 > HTTP/2 > HTTP/1 in raw RPS?

Heavier reverse workloads

Windows — heavier reverse GET (64 KiB / 256 KiB)

Linux — heavier reverse GET (64 KiB / 256 KiB)

Windows — POST 64 KiB request + 64 KiB response

Linux — POST 64 KiB request + 64 KiB response

Windows — lossy / high-RTT (H2 HOL)

Linux — lossy / high-RTT (H2 HOL)

TLS termination cost (H1 TLS → cleartext origin)

Windows

Linux

Other measurements

Raising limits on large hosts

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Linux (GitHub-hosted `ubuntu-latest`)