Why is my broadband slow?
Published by Pulse (SearchSwitchSave.com). Reviewed April 2026 by the UKSpeedTest editorial team led by Dr Alex J Martin-Smith.
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, latency, and jitter. Upload speed is not measured in the current release.
Related guides
Useful tools from the FBRE network
If you want a second opinion or next-step tools, try HowFast for an additional speed-check perspective, Laggy for latency-focused checks, Broadband Map for postcode availability context, and BroadbandSwitch.uk when you are comparing deals before switching.
You can browse the wider site list at FBRE.uk.
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.