Why is My Broadband So Slow? Causes and Fixes
Slow broadband is one of the most frustrating household problems. However before calling your provider or switching supplier it is worth checking these common causes — many of which you can fix yourself in minutes.
In this guide
Step 1 — run a speed test first
Before investigating causes run a broadband speed test to find out what speeds you are actually getting. This tells you whether you have a genuine speed problem or whether something else — like a slow device or website — is causing the issue.
How to run a speed test:
1. Go to fast.com or speedtest.net on your device
2. Click the button to start the test
3. Wait 30-60 seconds for results
4. Note your download speed, upload speed and ping
5. Compare to the speed promised in your broadband package
What counts as slow? If your speed test shows significantly less than the speed advertised in your package — typically below 50% of the headline figure — you have a genuine speed problem worth investigating. Furthermore if speeds vary dramatically between tests at different times of day this suggests network congestion.
Router problems — the most common cause
Your router is a small computer and like all computers it benefits from a regular restart. Over time routers accumulate temporary files and memory issues that slow performance. Consequently a simple restart resolves the majority of slow broadband complaints.
🔄 Restart your router — switch off at the wall, wait 30 seconds and switch back on. Furthermore do this weekly as a preventative measure.
📍 Check router position — routers placed inside cupboards, behind TVs or on the floor perform significantly worse. Move it to a central elevated open position.
🌡️ Check for overheating — routers that feel very hot to the touch may be throttling their performance. Additionally make sure the vents are not blocked and the router has space to breathe.
📅 Check router age — routers over 3-4 years old may struggle with modern internet demands. Contact your provider to request a replacement — most will send one free of charge.
Wi-Fi signal issues
Slow Wi-Fi is not the same as slow broadband. Your broadband connection from your provider may be perfectly fast — however the Wi-Fi signal from your router to your device can be the bottleneck. Furthermore walls, floors and other electronics all reduce Wi-Fi signal strength.
📡 Move closer to your router — run a speed test right next to your router to establish a baseline. If speeds improve significantly your Wi-Fi signal is the problem rather than your broadband.
📶 Switch to 5GHz — if your router broadcasts on both 2.4GHz and 5GHz connect to the 5GHz network for faster speeds on nearby devices
🔌 Use ethernet — plugging directly into the router with an ethernet cable eliminates Wi-Fi issues entirely for devices that don’t need to move
📡 Add a Wi-Fi extender or mesh system — if signal is weak in certain rooms a Wi-Fi extender or mesh system dramatically improves coverage throughout the house
Network congestion — the evening slowdown
If your broadband is consistently slow between 6pm and 10pm but fast at other times network congestion is almost certainly the cause. This happens because many households in your area are online simultaneously — consequently the shared infrastructure in your local area becomes overloaded.
This is particularly common with standard fibre (FTTC) connections which share capacity between multiple households. Full fibre (FTTP) connections generally have less congestion and more consistent speeds throughout the day.
What to do: If evening congestion is a persistent problem contact your provider and report it — they may be able to investigate local network issues. Alternatively upgrading to full fibre broadband if it is available at your address typically resolves peak-time congestion significantly.
Too many devices using bandwidth
Every device connected to your Wi-Fi uses a share of your available bandwidth. Furthermore some devices and apps consume bandwidth in the background without you realising — including automatic software updates, cloud backups, smart home devices and streaming services left running on standby.
📱 Check connected devices — log into your router’s admin panel (usually at 192.168.1.1) to see all connected devices. Remove any you don’t recognise.
⬇️ Pause large downloads — if someone is downloading a large game update or backing up to the cloud it will slow everyone else down. Schedule large downloads for overnight.
📺 Check for background streaming — TVs and devices left on standby sometimes continue streaming in the background. Consequently turn them off completely rather than leaving them on standby.
Line or infrastructure problems
If you have tried everything above and your broadband is still slow the problem may be with the physical line or infrastructure connecting your home to the exchange. This is particularly common with older copper telephone lines which degrade over time — especially in wet weather.
🌧️ Check if speed drops in wet weather — a consistent pattern of slower speeds during or after rain strongly suggests a physical line fault
📞 Test with the master socket — plug your router directly into the master phone socket (usually near the front door) and run a speed test. Additionally remove any splitters or extension cables. If speed improves the internal wiring is the problem.
📞 Report a fault to your provider — if you suspect a line fault contact your provider. They are obliged to investigate and fix genuine line faults free of charge. Furthermore under Ofcom rules they must compensate you if repairs take too long.
Your package may simply be too slow
Sometimes the problem is simply that your current broadband package does not provide enough speed for your household’s needs. This is particularly likely if your household has grown — more people working from home, streaming 4K content or gaming simultaneously — since you last upgraded your broadband.
As a rough guide a household of 3-4 people doing a mix of streaming, working from home and gaming needs at least 60-100Mbps. Furthermore a basic package of 10-30Mbps — which was sufficient five years ago — may simply not be enough for modern usage patterns.
When to switch to a faster broadband deal
If you have tried the fixes above and your broadband is still consistently slow it may be time to switch to a faster package or a different provider. Additionally if your current contract has ended you may be on an expensive out-of-contract rate — consequently switching could get you faster broadband for the same or even lower price.
Signs it’s time to switch:
✓ Consistently slow speeds after trying all fixes
✓ Your contract has ended — you’re likely overpaying
✓ Full fibre is now available at your address
✓ Your household’s usage has grown significantly
✓ Your provider’s customer service has been unhelpful
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Compare broadband deals →Quick fixes to try right now:
🔄 Restart your router — switch off for 30 seconds
📍 Move router to a central elevated position
🔌 Plug in with ethernet instead of Wi-Fi
📶 Connect to 5GHz band instead of 2.4GHz
⬇️ Pause any background downloads or backups
🕐 Run a speed test at different times of day
📞 Report a fault if speeds drop in wet weather
Related guides
How to boost your Wi-Fi signal → What broadband speed do I need? → What is full fibre broadband? →Still slow? Find a faster broadband deal
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Compare broadband deals →Written by the FastSwitch team · Last updated May 2026
FastSwitch is a free UK broadband comparison service. We may earn a commission when you switch via our site — this never affects the deals or prices you see.
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