A speed test can show less than the speed in your internet plan because it measures a particular device, connection path, test server, and moment—not just the ISP’s service. Wi-Fi, other household traffic, busy networks, line conditions, and the test route can all affect the result. To narrow down the cause, compare your plan’s exact speed commitment with repeated tests from a computer connected to your router by Ethernet.
What does your ISP’s promised speed mean?
First check the plan details and contract. Providers may describe a speed as “up to,” an estimate, a minimum, or a guarantee; these terms are not interchangeable. The FCC defines an advertised speed as the downstream and upstream bandwidths an end user may reasonably expect, but that definition does not make every advertised figure a universal guarantee or determine the terms of your individual contract. Read the FCC’s Broadband Data Collection definitions.
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There are three different points of comparison: the speed stated for your plan, the service delivered to your router, and the performance experienced by a particular device. Ofcom’s UK measurements assess delivery to the router. A device’s result can also reflect Wi-Fi, in-home wiring, other household activity, the device itself, and the server hosting the content. Ofcom explains the scope of its 2023 broadband report.
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Wi-Fi adds another link to measure
A phone or laptop on Wi-Fi measures both the broadband connection and the wireless link between the device and router. Distance, obstacles, router capability, and wireless conditions can reduce the result. Testing with Ethernet directly to the router removes Wi-Fi as a major variable; it does not change the speed of the ISP service itself. Ofcom recommends a direct Ethernet connection for a more accurate test and notes that distance can affect Wi-Fi performance in tests of particular routers. See Ofcom’s practical broadband speed advice.
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Devices and household traffic differ
Different phones, computers, and software versions may produce different readings. So can other activity on your home network: streaming, downloads, backups, and other connected devices share capacity. Google’s explanation of its Google Wifi router test identifies device characteristics and congestion on the home Wi-Fi network as factors; that description applies to Google’s test, not every speed-test service. Google describes how its router speed test works.
Time and network congestion matter
Internet traffic is shared, so performance can vary with time of day and congestion. Ofcom lists time of day and provider traffic-management policies among possible influences; Google notes that congestion can occur on the home network or elsewhere and may be worse at peak times. One low result cannot establish that congestion caused the shortfall.
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As context—not an individual guarantee—Ofcom reported that across connections in its UK March 2023 measurement, average download speed during the 8–10 pm peak period was 95% of average maximum speed. Ofcom said the report was its last planned Home Broadband Performance report in that series, so the figure is not a new 2026 measurement and does not predict what one household should receive. Read the report and its measurement context.
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A damaged line or interference from in-home wiring can slow some broadband connections. For telephone-line broadband, Ofcom advises connecting the router directly to the main phone socket where possible; that advice does not apply to every fibre or cable installation. The test server and network route also matter: results to different servers need not match, and a test to one endpoint may not predict how every website or app performs. Google says its Google Wifi router test measures to Google servers and that the locations of the user and server can affect results.
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How to check whether the gap is persistent
- Check the commitment for your address and plan. Review the contract or ask your provider what speed is estimated or guaranteed for your service. Note whether the figure is “up to,” an estimate, a minimum, or a guarantee; do not treat a headline package speed as automatically equivalent to a Wi-Fi test result. Ofcom explains how UK providers covered by its codes disclose speed estimates. Check Ofcom’s guidance on speed estimates.
- Connect a computer to the router with Ethernet. Run the test on a computer plugged directly into the router, rather than on Wi-Fi if possible. This helps distinguish wireless limitations from the service reaching the router. Ofcom describes Ethernet testing as the most accurate way to test in its UK consumer guidance.
- Pause heavy household use. Temporarily stop streaming, downloads, cloud backups, and other bandwidth-intensive activity, and test one device at a time. This controls for some in-home contention; it does not guarantee a faster result.
- Repeat under different conditions. Test several times over multiple days, including both a busy evening and a quieter period. Record the date, time, connection method, device, server if shown, and result. Ofcom recommends repeated tests over several days and varying the time.
- Contact your provider if the gap persists. Share the recorded wired results and ask the provider to check the service or line and explain the speed commitment that applies to your plan. Ofcom recommends contacting the ISP first.
What if you are in the UK?
Ofcom’s speed protections are specific to the UK and to providers signed up to its broadband speeds codes; they should not be assumed to apply to every provider or to customers elsewhere. Under those codes, covered providers should disclose a minimum guaranteed speed before sign-up and provide peak-time estimates. Ofcom defines home busy hours as 8–10 pm. If you report a problem that is within the provider’s network and it cannot be fixed within 30 days, the code requires the customer to be offered a right to exit without penalty. Check whether your provider participates and how the code applies to your contract. Outside the UK, consult your local regulator and your own contract. See Ofcom’s broadband speed guidance.
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