Measurement
Speed test results are usually shown as one big number, but that number is only one part of the picture. Here is what each measurement means and how to use them together.
Download speed
Download throughput is the rate at which data can be pulled from a test server. It is useful for large transfers, streaming and backups. Because it depends on the server, route and time of day, compare results from the same test node rather than across different services.
Ping
Ping is the round-trip time for a small request. Lower is generally better for interactive applications, but stability matters too. A stable 40 ms connection often feels better than a connection that swings between 10 and 120 ms.
Jitter
Jitter measures how much ping varies between samples. It is especially important for voice and video. If jitter is high, real-time applications may stutter even when download speed looks healthy.
Packet loss
Packet loss is the percentage of probe requests that did not return a response. Even 1–2% loss can cause visible problems because retransmissions add delay. Persistent loss usually points to a local link, Wi-Fi interference or a problem farther along the route.
A practical approach
- Test at the same time of day across several days.
- Use a wired connection when possible.
- Compare the pattern, not a single run.
- If results are consistently poor, contact your provider with the numbers and timestamps.
Run a test to see all four measurements in one place.