Start by finding where the slowness is
“Slow Wi-Fi” can mean several different things. The connection might be slow everywhere, slow in one room, slow on one device, or slow only at certain times. Before changing anything, it helps to work out which of those applies, because the causes and fixes are quite different.
A quick test: try a wired connection, or stand next to the router and try the same task. If it is fine there and slow elsewhere, the problem is the wireless part. If it is slow even next to the router or on a cable, the problem is more likely the router itself, the provider’s line or the service you are using.
Distance and obstacles
Wi-Fi signal fades as it travels, and walls, floors, mirrors, metal objects and water (including fish tanks) absorb or reflect it. Dense materials such as brick, concrete and stone are usually worse than plasterboard. A device several rooms away may connect, but at a much lower data rate, and it also takes longer to send each piece of data, which uses more of the shared airtime.
What helps: move the router to a central, open, raised position away from metal and cupboards. If that is not enough, consider a wired access point or a mesh system.
Interference from other signals
Wi-Fi shares radio frequencies with other things. The 2.4 GHz range in particular is used by microwave ovens, cordless phones, baby monitors and Bluetooth gadgets such as Bluetooth earbuds. Neighbouring Wi-Fi networks on the same or overlapping channels add to the noise, which is especially noticeable in apartment buildings.
What helps: use the less crowded 5 GHz range, or 6 GHz where your equipment supports it, for devices that are close enough. Many routers can pick a quiet channel automatically, and a manual change is sometimes worth trying if yours does not seem to.
Congestion on your own network
Every device on a channel takes turns to transmit, and the router’s connection to the internet is shared too. A household with several people streaming, gaming, on video calls and syncing photos can use up the capacity available. Large downloads such as software updates or cloud backup may run in the background without you noticing, taking a big share while you wonder why a page loads slowly.
What helps: pause or schedule heavy transfers for off-peak hours, and look for devices or apps using more than you expected. Some routers offer settings that prioritise certain traffic, though they vary in how well they work.
Old devices and old routers
Wi-Fi has gone through several generations, each generally faster and better at handling many devices. An older phone, laptop or smart TV may only support an older generation, so it connects at a lower speed than a newer one would. A slow device can also take up more than its fair share of airtime, since it needs longer to send each message, which can drag down the others on the same channel.
The router matters as well. One that is many years old might lack newer features, run hot, or no longer receive updates. A modern router will not make an old device faster, but it can improve how well the whole network copes.
Problems that are not really Wi-Fi
Sometimes the wireless part is blameless:
- The provider’s line. Faults, maintenance or evening congestion on a shared line can slow everything, including wired devices.
- The plan itself. A modest plan shared among many people will feel slow however good the router is.
- The website or service. A busy server can be slow for everyone.
- A single device. Low storage, a long list of background apps or an out-of-date operating system can make a device seem to have network trouble when it has not.
- The lookup stage. A slow name lookup delays the start of page loading even when the connection is quick afterwards.
A speed test, run on a cable and then over Wi-Fi, helps tell these apart.
A sensible order of fixes
- Restart the router and the affected device. This is boring, but it clears many temporary faults.
- Move closer to the router, or move the router, and see if it improves.
- Check which band the device is using and whether a faster one is available.
- Look for heavy background traffic from updates, cloud backup or streaming.
- Update the router’s software and the device’s wireless drivers or system.
- Use a cable for devices that don’t move.
- Only then consider new equipment, such as a better router or extra access points.
Spending money last, not first, tends to give the best value, because the cause is often position, a single device or interference.
When to contact your provider
If a wired test falls well short of your plan across several tries, at different times, contact the provider and share your results. Outages and line faults are outside what you can fix at home. Also check the status page or notices, since a regional problem can look exactly like a home one.