Zubaer Tools
Network utility ZUBAER TOOLS / WORKBENCH

Connection Quality Test

See what happens to latency when your line is busy. That extra delay can explain choppy calls and lag even when your speed looks good.

Choose a test
Runs only when you start it.
TEST STATUS
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Live latency

Milliseconds
No samples yet.
0–100 msSamples in order →

Connection results

Download
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Measured throughput

Upload
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Measured throughput

Idle latency
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Median round trip

Jitter
—

Variation between idle samples

Latency while downloading
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Median during downloads

Latency while uploading
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Median during uploads

Reading the results

Why is my connection lagging?

Compare idle and loaded latency

Idle latency is the time for a small request to reach the test server and come back. If that time jumps when you upload or download, a busy connection may make games or calls feel slower.

Pick a fair comparison

Try the same test mode on Wi-Fi and Ethernet, or compare with and without a VPN. The result measures this browser’s path to our test endpoint, so it can differ from your router, your ISP’s advertised speed, or another test server.

Use the full test for a fast connection

The quick test saves mobile data. Very short transfers may end before there are enough samples for a loaded latency result. The full test uses larger transfers, but both still measure a single stream and do not measure packet loss.