How to Fix Slow Wi-Fi Speeds on Windows 11

First, find out whether it's the PC or the network

Wireless speed claims are worthless without a comparison. Run any speed test on a phone or a second device, standing next to the laptop, on the same network and at the same time: a large gap between the two devices convicts the PC, similar numbers convict the network. Repeat the test once while sitting close to the router — behind two walls, 5 GHz falls off sharply, while 2.4 GHz keeps going but carries much less speed. Only after this isolation do Windows-side fixes mean anything.

If both devices crawl, work the network side: reboot the router (thirty seconds without power clears most transients), check whether you are on the crowded 2.4 GHz band in a building full of networks, and find out whether the line itself is degraded — your provider's status page or a support call settles that. One Windows setting deserves a look regardless: Delivery Optimization, which lets your PC exchange update downloads with strangers over the internet; on a slow line that sharing is a measurable brake. It lives under Settings → Windows Update → Advanced options → Delivery Optimization, and the toggle is called “Allow downloads from other PCs”.

• Run the same speed test on a phone beside the laptop — a big gap means the problem is the PC
• Retest close to the router: 5 GHz drops behind walls, 2.4 GHz goes further but slower
• Reboot the router: thirty seconds without power clears most transients
• In a building full of networks, 2.4 GHz is congested — prefer 5 GHz when you can
• Check Delivery Optimization: Settings → Windows Update → Advanced options → Delivery Optimization
• Pause OneDrive sync and backups: a full upload can quietly eat the whole line

The Windows-side fixes that actually matter

Open Device Manager (Win+X → Device Manager), expand Network adapters and open the properties of your Wi-Fi adapter. On the Power Management tab, clear “Allow the computer to turn off this device to save power” — on battery, Windows 11 parks the radio aggressively, and that costs throughput and latency. On the Advanced tab the property names vary by vendor, but two are worth seeking out: “Preferred Band”, which you can set to prefer 5 GHz, and “Roaming Aggressiveness”, where a middle value suits most homes. A driver update belongs in the same pass: Windows Update sometimes carries one under Settings → Windows Update → Advanced options → Optional updates → Driver updates, otherwise take it from the adapter maker — Intel, Realtek, MediaTek — rather than from a generic driver-updater utility.

Two more checks complete the pass. In Settings → Network & internet → Wi-Fi, make sure the connection is not flagged as metered — it does not throttle speed directly, but it pauses updates and confuses apps into behaving strangely. And if the slowness began right after a Windows or driver update, roll the driver back on the same Driver tab instead of updating further; the newest driver is not always the best one for your exact card.

Keeping the speed you restored

The fixes above hold as long as the environment does. Keep the router out in the open — not inside a cabinet, not on the floor next to metal — and match the band to the room: 5 GHz for the spaces near the router, 2.4 GHz for the far corners it alone can reach. In apartment buildings the 2.4 GHz band is often crowded by a dozen neighbors; if one network name covers both bands and the laptop keeps hopping between them, split them into separate names and pick the right one manually. Routers that slow down after weeks of uptime are a real breed, and many models offer a scheduled restart in their settings — a legitimate fix, not a superstition.

Watch what travels alongside your traffic. Cloud sync, backups, game launchers and Windows Update can saturate a line invisibly; Task Manager's Performance tab shows total network use, and when nothing should be running but the graph is full, something is. If the goal is a machine that stays light rather than one that gets repaired twice, that is where a maintenance tool pays off: Kleaner PRO's scheduled cleanup keeps temp files, caches and update leftovers from piling up, so the only things competing for your bandwidth are the ones you actually launched.

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