What Affects Your Broadband Speed?

What affects your broadband speed comes down to a mix of your connection type, the kit inside your home, how far you sit from the exchange, and how many people are online at once. Some of these you can fix yourself in minutes. Others depend on the technology your home is wired with, and may need a switch to a faster package or provider.

This guide walks through the main factors, with current UK data from Ofcom, so you can work out whether your speed is normal, slow, or fixable.

• Your connection type matters most – full fibre (FTTP) can reach 1Gbps, while older copper ADSL lines manage 8-24Mbps.
• In-home factors like router placement, router age, WiFi interference and the number of connected devices can slow real-world speeds well below what you pay for.
• Distance from the exchange or street cabinet reduces speed on copper lines, but not on full fibre.
• Network congestion between 8pm and 10pm is the standard UK peak window, and advertised speeds are measured here.

Connection type: the biggest factor in your broadband speed

Your connection type is the single biggest factor affecting your broadband speed, because it sets the ceiling everything else works within. A full fibre line can deliver speeds an old copper line physically cannot reach, no matter how good your router is.

The UK currently uses four main connection types, each with different real-world speeds:

Part-fibre (FTTC) is the most common cause of confusion. The fibre only runs as far as a green street cabinet, then a copper line covers the final stretch into your home, which caps real-world speeds at around 30 to 70Mbps. Full fibre (FTTP) removes that copper bottleneck entirely.

Ofcom’s Connected Nations 2025 report, published 19 November 2025, put the UK average maximum download speed at 285Mbps, up from 223Mbps in 2024. Northern Ireland led on 325Mbps, followed by England (288Mbps), Scotland (273Mbps) and Wales (243Mbps), largely reflecting differences in full-fibre availability and take-up across the UK nations. If your speed is well below your nation’s average, your connection type is the first thing to check. Our broadband speed explained guide breaks down what each figure means.

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How distance from the exchange affects speed

Distance from your nearest exchange or street cabinet reduces broadband speed on copper lines, because the signal weakens the further it travels along old copper wiring. This affects ADSL and FTTC connections, but not full fibre.

In the UK, the maximum range for ADSL broadband is roughly 5.5 kilometres (3.4 miles) from the exchange. Speeds can start to deteriorate at much shorter distances though, especially if the copper lines are old or in poor condition. A neighbour two streets closer to the cabinet can receive a noticeably faster connection on the same package.

Ofcom’s Speeds Code of Practice confirms why this matters: speed estimates are based on data from customers with similar property characteristics, including distance from the exchange or street cabinet, which affect speed on copper lines. Full fibre carries data as light through glass, so distance has almost no effect on the speeds it delivers.

Router placement, age and WiFi interference

Your router and WiFi setup can slow your real-world speed far below what your line is capable of, even on a fast connection. The router’s location, its age, and physical obstacles between it and your devices all play a part.

Where you put your router

Router placement affects WiFi speed because the signal weakens with distance and obstacles. Devices connected over WiFi, particularly those far from the router, experience slower speeds than those nearby. Place the router on a shelf or table in a central, open spot rather than tucked behind a TV or inside a cupboard.

Furniture, walls, ceilings and materials like concrete, metal and plaster all weaken a WiFi signal. Microwaves and cordless phones can interfere too. And ignore the viral tip about wrapping tin foil around your router – it can block the signal and make things worse.

How old your router is

An old router can cap your speed regardless of how fast your line is. Older routers may only support outdated wireless standards like 802.11n, which limits speeds to around 150Mbps even if your package offers far more. Modern routers using WiFi 6 (802.11ax) handle gigabit speeds and multiple devices far better.

If your router is more than five years old, it likely lacks the standards needed to deliver the speed you pay for. The router’s ports matter too – a gigabit connection running through a router that only supports 100Mbps ports is limited to a fraction of its potential.

Wired versus wireless

A wired Ethernet connection is faster and more stable than WiFi, because it removes signal strength and interference from the equation. Connect important devices like a gaming console or work computer directly to the router with an Ethernet cable. It also gives you the most accurate reading when you run a speed test.

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Too many devices and network congestion

The number of devices on your network and congestion on the wider network are two of the most common reasons broadband feels slow in the evening. Both share the available bandwidth between more demands at once.

Connected devices in your home

The more devices connected to your network, the less bandwidth each one gets. A large household streaming, gaming, video-calling and downloading at the same time will see slower speeds across every device. Smart TVs, phones, tablets, consoles and smart-home gadgets all draw on the same connection, and guests joining your WiFi add to the load.

Peak-time congestion on the network

Network congestion happens when millions of people stream, browse and game at the same time, typically between 5pm and 9pm. On older copper or part-fibre technology this can slow your connection. Full fibre connections tend to hold consistent speeds regardless of how busy your neighbourhood is.

This is also why advertised speeds can look different from what you experience. Under Ofcom rules, providers only have to advertise the average speed received by at least 50% of customers during peak time, defined as 8pm to 10pm. So an “average 67Mbps” figure already accounts for busy-period slowdown. Whether your choice of broadband provider makes a difference often comes down to the network technology behind their packages.

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Does weather affect your broadband speed?

Weather can affect broadband speed on copper and overhead lines, but has almost no effect on underground full fibre. Storms and high winds can disrupt outdoor lines and cables, and water getting into ageing copper joints can cause intermittent drops.

If your speed worsens noticeably during bad weather, that is usually a sign your connection still relies on copper somewhere along the line. Full fibre run underground is far more resistant to weather-related faults. Openreach is steadily replacing copper – in May 2026 it added another 1.69 million premises to its copper stop-sell programme, pushing more homes towards full fibre digital lines.

Your rights if speeds are too slow

You may be able to leave your broadband contract penalty-free if speeds consistently fall below the minimum guaranteed level your provider gave you. This protection comes from Ofcom’s voluntary Broadband Speeds Code of Practice, updated in March 2019.

Most major UK providers, including BT, EE, Plusnet, Sky, TalkTalk, Vodafone and Virgin Media, have signed up. When you join, they must give you a minimum guaranteed speed, tell you what to expect at peak times, and let you exit if speeds drop below the guarantee.

The mechanism is straightforward. If your speed consistently falls below the minimum guaranteed figure, you contact your provider. If they cannot fix it within a minimum period of 30 days, you can leave the contract without an early termination charge. The guaranteed speed is deliberately set lower than the advertised speed, so check that number before you complain. Our guide on complaining about broadband speed explains the process in detail.

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How to test and improve your broadband speed

To get an accurate speed reading, connect a device directly to your router with an Ethernet cable and run an online speed test. Testing over WiFi gives a lower figure that reflects your in-home setup, not the speed reaching your home.

If the wired result is close to your package’s advertised speed, your line is fine and any slowdown is in-home. Quick wins that often help:

• Move the router to a central, open position off the floor.
• Replace a router more than five years old with a WiFi 6 model.
• Use Ethernet for the devices that matter most.
• Reduce the number of active devices at peak times.
• Keep the router away from microwaves, cordless phones and large metal objects.

If your wired result is well below what you pay for, and the slowdown isn’t peak-time congestion, contact your provider. And if your home is still on ADSL or part-fibre, upgrading to full fibre is usually the change that makes the largest difference to your everyday speed.

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