Download
—Mbps
Acknowledged shared window
Network estimate
Speed test
A same-origin estimate of download, upload, and HTTP latency. Useful measurements — not a last-mile lab result.
Before you start — up to 400 MiB payload
This test may transfer up to 400 MiB total payload (about 320 MiB download + 80 MiB upload), plus small HTTP latency probes. Warm-up is hard-capped (≤8 MiB down / ≤4 MiB up) so measurement always keeps the rest. The cap is application payload; TLS and HTTP overhead is extra. Time-capped. It does not auto-run.
- Scored throughput is server-acknowledged bytes ÷ shared wall-clock time after a short ramp exclude. Fast links cannot fill a long window inside 400 MiB and are labelled as estimates.
- The gauge is display-smoothed on a fixed log scale (1–1000 Mbps). Parallel HTTP requests may share HTTP/2 or HTTP/3 — they are not separate TCP connections.
- Idle figures are HTTP round-trips, not ICMP ping. Cancel anytime. No third-party scripts, tracking, or extra fonts.
Live display
—Mbps
Waiting
Smoothed for display — not the scored result.
Ready — press Start (up to 400 MiB payload).
IdleUpload
—Mbps
Server-acknowledged
Idle min
—ms
Lowest HTTP RTT
Idle median
—ms
HTTP RTT, not ICMP
Jitter
—ms
Mean abs successive diff
Loaded (down)
—ms
HTTP during download
Loaded (up)
—ms
HTTP during upload
Payload used this run0 B / 400.00 MiB
PhaseIdle
Parallel requests—