How to get an accurate speed test result
Six small things that make the difference between a number you can trust and one that sends you on a wild goose chase.
A speed test measures whatever happens to be in the way at that moment. To measure your connection, you want as little in the way as possible. Six habits.
1. Use a cable for the important test
Wi-Fi is wonderful and also the number one source of confusing results. If you want to know what your provider is actually delivering, connect a laptop to the router with an Ethernet cable. Then test over Wi-Fi as well — the gap between the two tells you how much your Wi-Fi is costing you.
2. Quiet the house
Pause streaming on other screens, cloud backups, game downloads and large uploads. Smart TVs and consoles update themselves silently; check them. You are trying to measure the whole pipe, not the part left over.
3. Close what you don't need
Browser tabs with video, a sync client catching up, Windows Update — all of it eats bandwidth. Close the big ones. And switch off your VPN unless you specifically want to measure the VPN.
4. Run it twice
The first run of any test warms things up: DNS lookups, TLS handshakes, the connection climbing to full speed. The second run, a few seconds later, is typically the more representative one. If the two differ wildly, run a third and look at the pattern rather than any single number.
5. Test at different times
Cable and mobile networks are shared. A result at 9 pm on Sunday can be half the result at 7 am on Tuesday — and both are "true". If you are gathering evidence for your provider, test at a few times across a couple of days and write the results down.
6. Read all six numbers, not just the big one
A big download number with high latency under load or any packet loss means a connection that will frustrate you on calls and games, however impressive the headline. Conversely, a modest 40 Mbps with low ping, low jitter and zero loss is a very pleasant connection to live with. Here's what each number means.
What's normal variation?
Results that differ by 5–15% from one run to the next are completely normal. Results that differ by 50% suggest something changed — a device started downloading, the Wi-Fi switched bands, or your provider's network is congested at that time.
A quick checklist
- Cable in, VPN off, other devices paused.
- Run twice; trust the second.
- Note the time of day.
- Check latency under load, jitter and packet loss, not just Mbps.
Do that and the number you get is one you can actually act on.
See your own numbers
Run the test — it takes about 20 seconds and needs no account.