Why is my broadband slow?
Published by Pulse (BroadbandSwitch.uk). Reviewed April 2026 by the UKSpeedTest editorial team led by Dr Alex J Martin-Smith (LinkedIn).
Slow broadband can come from your line, your Wi-Fi, your device, or the time of day. Work through checks in a clear order to avoid guesswork.
Start with fair testing
- Run Pulse on your usual setup.
- Repeat with Ethernet if possible.
- Repeat at another time of day.
Common causes
- Busy Wi-Fi and poor router placement.
- Background updates and cloud sync.
- Peak-time congestion patterns.
Pulse measures download speed, upload speed, ping and jitter, and grades how your ping holds up when the line is busy.
Related guides
More free tools from BroadbandSwitch.uk
Before you switch, compare live deals at your postcode on BroadbandSwitch.uk, work out the speed your household really needs with RightSpeed, find the best spot for your router with RouterMap, and watch ping and bufferbloat live on the broadband quality monitor.
FAQ
Should I complain after one slow result?
Usually not. Providers respond better to a short pattern of fair tests across more than one day, with notes on setup and time. One screenshot is easy to dismiss as a momentary blip.
Can old hardware cap results?
Yes. Older Wi-Fi clients, ISP routers past their best, and cheap switches can limit what you see in a speed test even when the line itself is capable. Rule out device limits before assuming the street network is at fault.
Is evening slowness common?
Yes, because both homes and networks get busier. If the drop is mild and occasional, that can be normal contention. If it is severe and repeatable on fair wired tests, escalate with evidence.
What evidence helps support?
Include dates and times, whether you used Wi-Fi or Ethernet, the room you tested in, and a few results rather than one. Mention real impact such as dropped calls or failed uploads, not only the Mbps figure.