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.

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	33,491	34,592	19,659	22,850	42,783	42,783	YARP
Reverse	HTTP/1 · TLS	HTTP/1 · plain	32,485	32,485	16,140	17,015	28,472	28,472	TWP
MITM	HTTP/1 · TLS	HTTP/1 · TLS	20,584	20,584	Not possible (no MITM)	Not possible	Not possible (no MITM)	Not possible
Reverse	HTTP/2 · TLS	HTTP/1 · plain	5,038	5,038	5,039	10,484	30,076	30,076	YARP
MITM	HTTP/2 · TLS	HTTP/1 · TLS	6,383	7,040	Not possible (no MITM)	Not possible	Not possible (no MITM)	Not possible
MITM	HTTP/2 · TLS	HTTP/2 · TLS	5,192	5,192	Not possible (no MITM)	Not possible	Not possible (no MITM)	Not possible
Reverse	HTTP/2 · TLS	HTTP/2 · plain	4,293	4,293	Not possible	Not possible	51,309	51,309	YARP
Reverse	HTTP/2 · plain	HTTP/1 · plain	6,698	6,698	Not possible	Not possible	37,064	37,064	YARP
Reverse	HTTP/2 · plain	HTTP/2 · plain	33,720	33,720	Not possible	Not possible	86,443	86,443	YARP
Reverse	HTTP/2 · plain	HTTP/2 · TLS	5,394	5,394	Not possible	Not possible	68,492	68,492	YARP
Reverse	HTTP/2 · plain	HTTP/3 · QUIC	3,989	3,989	Not possible (no QUIC)	Not possible	17,715	17,715	YARP
Reverse	HTTP/3 · QUIC	HTTP/1 · plain	8,578	8,578	Not possible (no QUIC)	Not possible	23,117	23,117	YARP
MITM	HTTP/3 · QUIC	HTTP/1 · TLS	6,433	6,433	Not possible (no QUIC)	Not possible	Not possible (no MITM)	Not possible
MITM	HTTP/3 · QUIC	HTTP/2 · TLS	3,489	3,489	Not possible (no QUIC)	Not possible	Not possible (no MITM)	Not possible
MITM	HTTP/3 · QUIC	HTTP/3 · QUIC	7,192	7,192	Not possible (no QUIC)	Not possible	Not possible (no MITM)	Not possible
Reverse	HTTP/1 · TLS	HTTP/2 · TLS	6,302	7,120	Not possible	Not possible	21,869	21,869	YARP
Reverse	HTTP/1 · TLS	HTTP/3 · QUIC	11,250	11,250	Not possible (no QUIC)	Not possible	12,844	12,844	YARP
Reverse	HTTP/2 · TLS	HTTP/3 · QUIC	4,420	4,420	Not possible (no QUIC)	Not possible	15,352	15,352	YARP

Windows sources: H1 / MITM rows reuse prior compare-same / compare-mitm (rps-ramp-20260817-184912 and earlier). H2/H3 reverse + bridges remeasured after client-window / streaming / frame-loop queue work: compare-bridges (rps-ramp-20260817-210802; warmup 2s; measure 5s; concurrency 8–64). h2c↔h2c refreshed after multi-origin H2 pooling + dedicated frame writers (rps-ramp-20260818-012238 TWP ~33.7k sustain @ c=64; YARP cell kept from prior rps-ramp-20260817-212332). nginx H2 terminate cell not re-run this pass (prior nginx numbers). Absolute RPS on this laptop swings with sequential-arm heat; nginx/Windows sustain is especially noisy.

After multi-origin pooling, TWP÷YARP on Windows h2c→h2c improved from ~8.5× behind (10k/86k) to ~2.6× (34k/86k) on this laptop — still a managed MITM floor, not parity.

nginx/Windows is a limited port. Use it for same-OS comparison only — not as the industry nginx baseline. YARP H3 reverse uses Kestrel HTTP/3 (HttpClient), not TWP’s transparent QUIC listen.

H2 TLS → H1 plain on Windows: fair terminate (http2-cleartext / nginx-reverse-http2 / yarp-reverse-http2) — YARP still leads sustain (~6×). 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).

Why nginx still leads on H1 plain reverse (~0.67× TWP): fair harness (split processes, same Kestrel origin). Absolute RPS swings by GHA VM; prefer the ratio. YARP sits in the managed band with TWP on tiny H1 reverse (TWP÷YARP ≈ 0.95 on H1 plain).

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 is nginx’s best case (and TWP’s worst)

The tables above use ~64 B keep-alive GET on loopback. That is a thin reverse proxy_pass workload: nginx’s C path wins on Linux H1 reverse, YARP is in the same managed band as TWP, and TWP still pays for a full session pipeline per request. “Comparable” on reverse only shows up when the work gets heavier — larger bodies, mutating methods, TLS handshake cost, or delay/loss that exposes HTTP/2 head-of-line blocking. Tiny JSON is the wrong target if the question is whether TWP can keep up with nginx as a reverse proxy under real traffic.

nginx still cannot MITM or speak QUIC in this harness; YARP cannot MITM. Those MITM paths remain TWP-only. YARP can fill reverse H3 / h2c / bridge rows where nginx cannot.

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 after H2 client-window + bridge streaming (rps-ramp-20260817-205100; warmup 3s; 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	3,244	3,464	131	195	2,874	2,874	TWP
HTTP/2 · TLS	HTTP/1 · plain	921	921	216	243	2,244	2,244	YARP
HTTP/3 · QUIC	HTTP/1 · plain	1,233	1,233	Not possible	Not possible	979	994	TWP

Pre-fix TWP H2 POST was ~60 RPS (RFC 64 KiB client window); H3 POST was 0 RPS (store-and-forward / connect abort). Post-fix H2 is ~2.4× behind YARP; H3 POST completes and leads this laptop run.

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;
};

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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 is nginx’s best case (and TWP’s worst)

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 is nginx’s best case (and TWP’s worst)

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`)