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Second beta — faster upload and download, lower latency under load

The second beta release, v1.0.0-beta.2, is out. The full list of changes is in the changelog.

Four servers compared (#126)

Citrus, Xray v26.10.17, sing-box v1.14.3 and mihomo v1.19.32 were measured as servers on one host, eight protocols, the same clients for all. The results:

  • Citrus leads upload: REALITY with 32 streams is 52% faster than the best of the others, and single-stream upload on REALITY and SS2022 is 40–49% faster.
  • Citrus uses the least memory per idle tunnel on most protocols.
  • sing-box leads AnyTLS, TUIC new connections and SS2022 download.
  • Xray leads Trojan and SS2022 upload with 32 streams.

These numbers were measured before the changes below. The method, the caveats and every table are in test/bench/compare/results/2026-10-18-four-cores/RESULTS.md in the repository.

Merged after the comparison

  • Download (#124). 64 KiB reads, and TLS records go to the socket together (in the getmikan/tls and getmikan/utls forks). With 32 streams, as the bench reports them: REALITY 2802 → 4235 MB/s, Trojan 2737 → 3936, SS2022 3895 → 4392.
  • Latency under load (#131). An echo next to eight downloads: 55–63 → 20 ms. For comparison, Xray is at about 77 ms and sing-box on SS2022 at about 47.
  • Idle tunnel memory (#129). Trojan −36% (37.7 KiB, below sing-box’s 43.6), AnyTLS −18%, REALITY −12%.
  • QUIC (#125). The gap to sing-box on new streams went from 10–12% down to 4–6%.

Upload write batching (#119) and fewer allocations per new connection (#118) were in dev before the comparison; its numbers already include them.

Fixes

  • TUIC: a CONNECT with a 255-byte domain no longer crashes the server before authentication (#125).
  • smux is replaced with the getmikan/smux fork: after an error a caller’s buffer is no longer sent (#123).
  • Limits: a race when closing a user over quota no longer touches the user’s new connections (#116).

CI

  • A -race job for the packages without races (#121).
  • A nightly performance check against mihomo (#127).

Known issues

The TUIC server accepts at most 2048 streams per QUIC connection. A client that opens more without waiting for stream credit (the sing-box client does this) gets errors on the extra ones.

Next

The AnyTLS rework (#130) is planned for the next beta. The rest is on the Roadmap.

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Citrus is free software under the GNU GPL v3, a fork of MetaCubeX/mihomo.