Slow WiFi almost always comes from one of three places: the wireless signal between your router and the device, the router's settings and congestion, or the internet plan itself. Plug one computer into the router with an Ethernet cable and run a speed test. If the cable is fast and WiFi is slow, the fault is in the wireless link, and the fixes below usually help.
Most advice online jumps straight to "buy a new router". That's sometimes right, but it's an expensive way to find out your laptop's WiFi card is the weak link. Test first, change one thing at a time, and re-test. Here's how to do it without special equipment.
Is it the WiFi, the router or the internet plan?
A five-minute split test saves hours of guessing. Run each test with other devices idle, and write the download speed down so you can compare before and after any change.
- Connect a computer to the router with an Ethernet cable and run a speed test.
- Switch to WiFi, stand next to the router, and run the same test again.
- Walk to the room where the connection feels slow and test there.
- Test a second device in the same spot, to see whether the problem follows the laptop or the room.
| Result | What it means | Where to look |
|---|---|---|
| Wired is slow too | Router, line or plan problem | Restart the router and modem, then contact your provider with your test results |
| Wired fast, WiFi fast near router, slow far away | Coverage and interference | Router position, band choice, channel, extender or mesh |
| Wired fast, WiFi slow even beside the router, one device only | That device's adapter, driver or antenna | Laptop settings and hardware, covered below |
| Fast in the morning, slow at night | Peak-hour congestion on the provider's side, or too many devices at home | Provider, or a plan and router upgrade |
| Speed tests are fine but some sites crawl | DNS or the site itself | Try a different DNS server |
How do you fix a weak or crowded wireless signal?
WiFi is radio, and concrete, metal, water and microwave ovens all weaken it. Reinforced concrete walls, common in Mumbai flats, weaken a 5 GHz signal much more than a plain brick partition does. Placement and band choice give the biggest gains for the least money.
Router position and bands
Put the router high, in the open and as central as you can, not in a cupboard, behind the TV or on the floor. Most modern routers broadcast two bands. The 2.4 GHz band travels further through walls but is slower and crowded with neighbours' networks, Bluetooth devices and microwaves. The 5 GHz band is faster over a short distance. Newer WiFi 6E and WiFi 7 hardware adds a 6 GHz band that is quick and quiet but has the shortest reach.
If your router merges both bands under one name, consider giving each band its own name in the router settings. You can then choose 5 GHz for the laptop you use near the router and 2.4 GHz for far corners.
Channels and channel width
In apartment blocks, dozens of networks share the same few 2.4 GHz channels. Channels 1, 6 and 11 don't overlap, so pick one of those that is least busy. On Windows, open Command Prompt and run netsh wlan show networks mode=bssid to see nearby networks, their channels and signal strength. Setting the 2.4 GHz channel width to 20 MHz reduces interference in crowded buildings, at a small cost to the theoretical top speed.
Extenders, mesh and wiring
A basic WiFi extender that uses one radio to talk to both the router and your device can halve the speed it relays. A mesh system with a dedicated link between nodes, or an access point connected by cable, performs better. Where you can run a cable, wiring a desktop or a TV directly to the router also frees airtime for everything else.
Which laptop settings quietly slow WiFi down?
When one laptop is slow and everything else is fine, start with what Windows reports. Run netsh wlan show interfaces. It lists the radio type (802.11n, ac or ax), the channel, the receive and transmit rates in Mbps and the signal percentage. If a modern router is on 5 GHz but your laptop reports 802.11n on 2.4 GHz at a low rate, the card or its connection is the limit.
- Adapter power saving. In Device Manager, open the WiFi adapter's properties, Power Management, and untick "Allow the computer to turn off this device to save power".
- Drivers. A generic Windows driver can perform worse than the one from the laptop maker. Install the driver from the maker's support page for your exact model.
- Background traffic. Open Task Manager, Performance, and check Wi-Fi activity. Cloud sync, Windows Update and game launchers can saturate a connection while you're not looking.
- VPN and proxy. A VPN adds distance and overhead. Disconnect it for the test.
- Network reset. Settings, Network & internet, Advanced network settings, Network reset, clears stubborn adapter settings. It also forgets saved networks and VPN adapters, so note your passwords first.
When is the laptop's WiFi hardware the problem?
WiFi cards are small and cheap, but they hide behind antenna cables that run up the screen hinge. Those cables pinch, loosen or break over years of opening and closing. A telltale sign is a signal that changes when you tilt the lid, or a laptop that shows one bar while sitting next to the router.
Older laptops may also have a card limited to 2.4 GHz or to older 802.11n speeds, which can't use a modern 5 GHz connection at all. Our price list shows the typical repair ladder:
| Service | Indicative range |
|---|---|
| WiFi driver reinstall and configuration | ₹350 - ₹399 |
| Antenna and cable repair | ₹399 - ₹999 |
| WiFi module upgrade | ₹999 - ₹2,499 |
| Antenna plus card replacement | ₹1,499 - ₹2,999 |
Prices are indicative and depend on the model and the part. If you're curious how this looks on a specific machine, read our guide to laptop WiFi not working or look at the WiFi card replacement service.
What about desktops?
Desktops often have no WiFi antennas at all, or a USB dongle. USB 3.0 ports and cables can leak noise into the 2.4 GHz band, so plug a WiFi dongle into a short extension cable away from other USB 3.0 devices. A PCIe WiFi card with antennas on a short cable, placed on the desk, usually beats a dongle, and an Ethernet cable beats both.
Which router settings are worth checking safely?
Update the router firmware, restart it occasionally, and check how many devices are connected. If you see devices you don't recognise, change the WiFi password and turn off WPS. Look at whether your plan matches the router: an older router may not be able to deliver the full speed of a newer fibre plan.
One warning before you touch anything: don't factory-reset a provider-supplied router unless you have your login details. On some fibre plans the router needs a username and password from your provider, and without them the connection won't come back. Our router configuration service can set one up if you're unsure.
Frequently asked questions
Why is WiFi fast on my other devices but slow on my laptop?
That points to the laptop: an outdated or generic driver, adapter power saving, a single-band or older card, or damaged antenna cables. Test at the same spot with both devices. If only the laptop is slow beside the router, the router isn't the problem.
Is 5 GHz always better than 2.4 GHz?
No. 5 GHz is faster at short range and less crowded, but it passes through walls poorly. In a far bedroom, 2.4 GHz may give a steadier connection even though its top speed is lower.
Will a WiFi extender fix a dead corner?
It can help, but a cheap single-radio extender often cuts throughput roughly in half. A mesh system or a wired access point placed near the dead zone gives a stronger result.
Do I need a new router?
Only after the split test says the router is the weak point. If wired speed is also low, call your provider. If WiFi is slow on one laptop only, a router replacement won't help.
If your laptop is the weak link, we can check the adapter, antennas and drivers and give a written quote. Book a free pickup or see the price list for indicative rates.
