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cfbench
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cfbench
cfbench is a lightweight, native Rust command-line speed test for Cloudflare's edge network. It measures download and upload bandwidth, idle latency and jitter, and latency while the connection is loaded. It has no TUI, browser runtime, telemetry service, or local database.
cfbench is unofficial and is not affiliated with, endorsed by, or supported by Cloudflare.
Install (Linux x86_64)
For Debian/Ubuntu it installs the verified .deb; for Fedora/RHEL-family systems it installs the verified .rpm. It asks for your password only when the package manager needs sudo. Other supported Linux distributions receive the verified standalone binary in ~/.local/bin.
curl -fsSL https://raw.githubusercontent.com/fcendesu/cfbench/main/scripts/install.sh | sh
To pin a release:
curl -fsSL https://raw.githubusercontent.com/fcendesu/cfbench/main/scripts/install.sh | CFBENCH_VERSION=0.1.1 sh
Manual package downloads are also available from GitHub Releases.
Build from source
Rust 1.95 or newer is required:
git clone https://github.com/fcendesu/cfbench.git<br>cd cfbench<br>cargo install --path .
Usage
result.json<br>cfbench --quiet --timeout 60">cfbench<br>cfbench --ipv4<br>cfbench --ipv6 --no-upload<br>cfbench --no-loaded-latency<br>cfbench --no-metadata<br>cfbench --json > result.json<br>cfbench --quiet --timeout 60
Run cfbench --help for the complete option list. Progress and diagnostics use stderr. --json writes exactly one schema-v1 JSON document to stdout and suppresses progress; --quiet also suppresses progress.
Example output
The values below are illustrative and will vary by connection. --no-metadata keeps public IP, network, and edge-location information out of the result.
$ cfbench --no-metadata<br>Testing against Cloudflare edge...<br>[latency 1/1] 18.42 ms<br>[download 100 KB 1/1] 71.25 Mbps — 11.2 ms<br>...
cfbench 0.1.1<br>Target: Cloudflare edge<br>Protocol: IPv6 / HTTP/1.1<br>Metadata: disabled<br>Measured at: 2026-07-26T12:00:00.000Z
Idle latency: 17.86 ms<br>Idle jitter: 1.44 ms<br>Download: 742.18 Mbps<br>Download latency: 29.73 ms<br>Download jitter: 4.10 ms<br>Upload: 216.94 Mbps<br>Upload latency: 47.81 ms<br>Upload jitter: 7.62 ms
Downloaded: 469.0 MB<br>Uploaded: 296.8 MB<br>Duration: 24.18 s
What it measures
Idle latency and jitter
Download and upload bandwidth
Download-loaded and upload-loaded latency and jitter
Transferred payload bytes, duration, negotiated HTTP version, and raw measurement points
Optional Cloudflare /meta context: public IP, ASN, network organization, and edge/location data
--no-metadata skips the /meta request completely. The tool does not collect or send results to a cfbench service.
Packet loss is deliberately not displayed or measured in the 0.1 release series. Cloudflare's metric requires TURN/WebRTC; cfbench does not substitute ICMP loss or present an incompatible value as packet loss.
Compatibility
cfbench follows Cloudflare Speedtest v1.12.1 for its request order, payload sizes, thresholds, percentile reductions, and loaded-latency rules. Native Rust timing cannot exactly reproduce the browser's PerformanceResourceTiming boundaries or browser-only TCP connection calibration, so results are methodology-compatible rather than numerically identical.
See installation details and measurement compatibility.
License
Licensed under the MIT License.
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