A browser-based speed test measures the actual data your device can send and receive at the moment you run it. That makes it an excellent real-world estimate — but several factors mean two back-to-back tests can differ, and why your result may not exactly match your plan.
What affects accuracy
- Wi-Fi vs wired — Wi-Fi adds overhead and is affected by distance and interference. See Wi-Fi vs Ethernet.
- Server distance — testing to a far server raises ping and can lower throughput. A nearby server gives higher numbers.
- Device & browser — older hardware, many open tabs, or VPNs cap results.
- Congestion — shared connections are slower at peak evening hours.
- Background usage — downloads, updates and other devices eat bandwidth during the test.
How to get the most accurate result
- Connect by wired Ethernet, or sit close to the router.
- Close other apps, downloads and tabs; pause other devices.
- Run the test three times and take the average.
- Test at different times of day to spot congestion.
Want to know how our own measurement works? Read how SpeedPulse works.
Frequently asked questions
Why do I get different results each time I test?
Network conditions change constantly — congestion, background apps, Wi-Fi interference and the test server all vary. Run a few tests and take the average for a representative figure.
Why is my speed test lower than my plan?
Wi-Fi overhead, distance from the router, older devices, peak-time congestion, and the distance to the test server all reduce measured speed. A wired test close to the router is most accurate.
Are browser speed tests reliable?
Yes, as a real-world estimate. They measure the actual data your device can move at test time. For the cleanest baseline, test wired, close other apps, and average several runs.
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