Fast connections need a bigger sample
This branch permits larger transfer samples when the earlier rounds are fast enough, helping avoid judging a fiber line only from tiny bursts.
Fiber Speed Test
Test a fast fiber connection with an interpretation built for higher throughput, upload symmetry and responsiveness while the line is busy.
High-speed samplingGigabit headroomUpload symmetryLoaded latency
Fiber Performance Test
High-speed throughput, upload symmetry and loaded-latency health
Ready—score / 100
Your fiber performance
Run a live test
Measure the connection and get a result designed specifically for this test.
No result yet. The live test uses Cloudflare measurement endpoints and interprets the same core metrics differently for this page’s user intent.
Download—Mbps
Upload—Mbps
Ping—ms
Jitter—ms
Loaded latency—ms
The live measurement connects directly to Cloudflare. Results are estimates and can change with Wi‑Fi, VPNs, device load, server routing and network conditions.
Symmetry matters
Many fiber services provide stronger upload performance than older access technologies. The result shows the upload-to-download relationship directly.
Device and Wi‑Fi limits still count
A slow Wi‑Fi link, older Ethernet adapter, VPN or busy device can cap the measured speed even when the fiber service itself is faster.
Bandwidth Test
Capacity, headroom and simultaneous use.
Open test →Network Speed Test
Network throughput, response and loaded health.
Open test →Download Speed Test
Downstream speed plus practical file download times.
Open test →Upload Speed Test
Creator uploads, cloud transfers and livestream headroom.
Open test →Connection Speed Test
Ping, jitter and connection stability.
Open test →All Speed Tests
Overall speed, stability and the full test family.
Open test →