Why Your Wi-Fi Is Slow on Windows 11 and What to Do About It

Slow Wi-Fi on Windows 11 — connection shows as connected but speeds are a fraction of what they should be — almost always traces to one of four things: distance and band selection, an outdated wireless driver, a power-saving setting on the Wi-Fi adapter, or other devices saturating the network. Fixing the right one often doubles real-world speed. For a broader walkthrough, our Complete Guide to Fixing Windows, Browser, and Software Errors is a good next read.

The first useful number to know: what speed should you actually be getting? Run a speed test at fast.com or speedtest.net while standing right next to the router with Wi-Fi connected. That’s your achievable maximum on this network. Then move to where you usually work and test again. If the result at your normal location is much lower, signal or interference is the issue. If it’s also slow next to the router: the router, the Windows machine, or the ISP is the bottleneck — not Wi-Fi propagation.

2.4 GHz vs 5 GHz — pick correctly

Modern routers broadcast on both 2.4 GHz and 5 GHz bands. They’re fundamentally different in trade-offs:

If you’re in the same room as the router but connected to 2.4 GHz: switch to 5 GHz. Speeds typically double. If you’re a few rooms away and on 5 GHz with weak signal: 2.4 GHz might actually be faster despite the lower theoretical max, because signal strength matters more than band rating.

Routers sometimes use the same network name (SSID) for both bands and let devices pick automatically — “band steering.” Windows doesn’t always make the right choice. To force a specific band: on routers with band steering, you can either disable it (use separate SSIDs for each band), or in Windows force-prefer 5 GHz via the adapter properties below.

Network adapter Properties → Advanced tab → “Preferred Band” or “Band Preference” → set to “Prefer 5GHz.” Adapter reconnects on the preferred band whenever it’s available.

Power saving on the Wi-Fi adapter

Windows 11 enables power saving on Wi-Fi by default, which throttles wireless throughput during low-activity periods. The transition between throttled and full-speed isn’t always smooth, so you see speeds well below what the connection should deliver.

Disable it: Device Manager → Network adapters → your Wi-Fi adapter → Properties → Power Management tab → uncheck “Allow the computer to turn off this device to save power.” Also check the Advanced tab → “Power Save Mode” or “MIMO Power Save” → set to “Maximum Performance” or “Disabled.”

Trade-off: laptop battery drains slightly faster because the Wi-Fi radio doesn’t enter low-power states. But Wi-Fi performance becomes consistently fast. If you specifically need long battery life and don’t need fast Wi-Fi, leave power saving on. Otherwise, disable it.

Update Wi-Fi driver from manufacturer

Windows Update installs basic Wi-Fi drivers that work but often lag behind manufacturer releases. Intel, Realtek, and Qualcomm all push frequent updates that improve speed, stability, and roaming behaviour.

Identify your Wi-Fi adapter: Device Manager → Network adapters → look for the wireless one (usually says “Wireless,” “Wi-Fi,” or includes “AC” or “AX” in the name). Note the brand — usually Intel, Realtek, or Qualcomm.

• Intel: intel.com/content/www/us/en/download-center → Wireless drivers
• Realtek: usually only available through the laptop manufacturer’s support page (Realtek’s own site rarely has the latest)
• Qualcomm/Atheros: laptop manufacturer’s support page

Install the latest version → restart → test speed. Driver updates frequently deliver 20-50% throughput improvements on older hardware, especially for Intel adapters which have a long history of meaningful driver-level performance gains.

Network congestion — who else is using the bandwidth

If multiple people are streaming 4K video, gaming, or downloading large files on the same network, individual devices feel slow even though the connection itself is fast. Most home networks have a single shared upstream pipe, and dividing it across multiple heavy users reduces what each gets.

Check who’s online: router admin → “Attached Devices” or “Client List” → see all active devices. Identify any consuming heavy bandwidth (smart TVs streaming, game consoles downloading patches, security cameras uploading footage).

Quick mitigation: pause the heaviest consumer temporarily and retest your speed. Long-term: QoS rules in the router can prioritise specific devices or applications, ensuring your video calls don’t get crushed by someone else’s torrent client.

Our guide on Wi-Fi disconnection issues covers the connection-stability problems that often accompany speed degradation, and our router troubleshooting covers the router-side issues that affect speed for all connected devices. For deeper network performance investigation, ThinkBroadband’s quality monitoring tools include continuous speed and quality logging that can reveal patterns over time.

Router placement matters more than people think

Wi-Fi signal degrades through walls, especially brick, concrete, and metal surfaces. A router in the corner of a basement won’t deliver good signal to the upstairs bedroom no matter how fast it is. Common bad placements:

• Inside a TV cabinet or closed enclosure
• Behind furniture against a wall
• In a corner of the house (radiates in all directions including outside the house, wasting half the signal)
• Right next to a microwave, fridge, or other large appliance
• On the floor (signal projects outward and is partially absorbed by the floor itself)

Better: elevated (top of a bookshelf), central in the house, in open air with line-of-sight to where you actually use it. Even moving the router 2 meters can substantially improve signal strength to specific rooms.

For homes too large for a single router to cover well: mesh systems (Eero, Google Nest WiFi, Deco) or wired access points distribute coverage. Single-router setups for a 2000+ sq ft home with walls usually have weak signal in distant rooms regardless of router quality.

Channel interference on 2.4 GHz specifically

If you’re stuck on 2.4 GHz (older device, distance from router, environment), channel choice matters. Of the 11 channels in North America (13 in EU), only channels 1, 6, and 11 don’t overlap with each other. If your router and three neighbours are all on overlapping channels, congestion drops everyone’s speed.

Tools to check: Wi-Fi Analyzer (Microsoft Store, free) shows what channels nearby networks use and how strong they are. Pick a channel with the least competition (often 1 or 11, since most routers default to 6 or auto-select 6).

Set the channel manually in router admin → Wireless → Channel → choose 1, 6, or 11 based on your area’s congestion. Save and reconnect. Speed often improves noticeably if neighbouring traffic was the bottleneck.

Outdated router

The router itself is sometimes the limit. A 5-year-old 802.11n (Wi-Fi 4) router caps at around 300 Mbps regardless of how fast your internet line is. Modern Wi-Fi 6 (802.11ax) routers easily exceed gigabit speeds and handle dozens of simultaneous devices better.

If you have a gigabit internet plan but a Wi-Fi 5 router from 2017, you’re paying for speed you can’t deliver wirelessly. A £80-£150 router upgrade pays for itself in usability quickly. Same for the Windows laptop’s Wi-Fi adapter — Wi-Fi 6 adapters can be added to older laptops via M.2 slot replacement (around £20-£30 for a card, £50-£100 for installation if you’re not comfortable doing it yourself).

DNS speed affects perceived speed

Pages feel slow even on fast connections if DNS lookups are slow. Switching DNS to a fast public resolver makes browsing feel snappier without affecting actual bandwidth.

Settings → Network and internet → your Wi-Fi connection → DNS server assignment → Manual → enter:

• Cloudflare: 1.1.1.1 and 1.0.0.1 (usually fastest)
• Google: 8.8.8.8 and 8.8.4.4
• Quad9: 9.9.9.9 (also blocks malicious domains)

This is a perceptual fix more than a throughput fix — pages start loading faster, even though download speeds for files don’t change. But the experience of “the internet feels slow” often relates to DNS as much as actual speed, so worth doing.

Speed test methodology

When measuring Wi-Fi speed, controlling variables matters. Random speed test results don’t tell you much. Better approach:

1. Test at the same location each time (e.g., your desk)
2. Test at similar times of day
3. Run multiple tests in succession; take the median, not the highest
4. Use the same speed test service for comparison
5. Confirm no other devices are simultaneously downloading or streaming

This lets you make like-for-like comparisons. “Speed jumped from 50 to 200 Mbps after I changed the channel” only means something if both numbers came from similar test conditions. Random testing produces random results.

The two highest-impact fixes are usually band selection (move to 5 GHz if available) and driver updates from the manufacturer. Combined, they often deliver 2-3x speed improvements without changing any hardware.

When wired comparison rules things out

One useful diagnostic: temporarily connect your laptop via Ethernet cable to the router and run the same speed test. This shows what your internet line can actually deliver, without Wi-Fi as a factor.

If Ethernet is much faster than Wi-Fi: Wi-Fi is the bottleneck (driver, signal, congestion). Apply Wi-Fi fixes. If Ethernet is also slow: the issue isn’t Wi-Fi at all — it’s the ISP, the modem, or the router. Different fixes apply.

This test takes 5 minutes (assuming you have an ethernet cable handy) and isolates the problem to the right layer immediately. Without it, you might spend hours fixing Wi-Fi when the actual issue is the ISP throttling at certain times of day.

VPN affecting perceived speed

If you’re running a VPN, the VPN adds overhead and routes traffic through additional hops. Realistic VPN speed: 70-90% of native connection. If you’ve been blaming Wi-Fi but you have a VPN running, disconnect it temporarily and retest. Often the “slow Wi-Fi” is actually VPN overhead that has nothing to do with wireless.

This is also why dual VPN testing matters: home network test → with VPN → without VPN → and the difference between the two is the VPN’s cost. Wi-Fi optimization can’t recover the speed the VPN is consuming for encryption.

Background sync and update activity

Windows itself sometimes downloads updates in the background, consuming bandwidth invisibly. Other apps with auto-sync (Dropbox, OneDrive, iCloud Drive on Windows, Steam library updates) can also push significant background traffic.

Check: Task Manager → Performance tab → Wi-Fi → look at current send/receive rates. If they’re high while you’re idle, something is using the network. Identify in Task Manager → Processes → sort by Network column.

Pause sync clients temporarily when you need maximum bandwidth for something else. Settings → Windows Update → “Pause updates for 1 week” if a large update is downloading and you need it to stop.

One particularly sneaky case: Windows Delivery Optimization can upload updates to other PCs on the network or even on the internet. Settings → Windows Update → Advanced options → Delivery Optimization → disable “Allow downloads from other PCs” or restrict to local network only. Frees up your upload bandwidth.

Realistic expectations and the bigger picture

For a 100 Mbps internet plan, Wi-Fi typically delivers 60-90 Mbps to a laptop in the same room as the router. Drops to 20-50 Mbps in distant rooms. These numbers are normal — not great, but normal.

For a gigabit plan, modern Wi-Fi 6 hardware delivers 500-800 Mbps in the same room. Drops to 200-400 in distant rooms. Anyone expecting to see 1000 Mbps on Wi-Fi from a gigabit line will be disappointed unless they’re standing within a couple of meters of the router with no other traffic.

Knowing what’s realistic prevents the trap of trying to fix what isn’t actually broken. If your internet plan is 200 Mbps and you’re getting 150 Mbps on Wi-Fi: that’s normal, no need to “fix” it. If you’re getting 30 Mbps from a 200 Mbps plan: something is wrong, and the fixes above apply.

One last optimization that’s easy to miss: the network adapter has dozens of Advanced tab settings that affect performance. Most can be left at defaults, but a few are worth checking on slow systems. “Roaming aggressiveness” (Intel adapters) — set to “Highest” if you move around with your laptop and want it to switch access points sooner; set to “Lowest” if you stay in one place and don’t want unnecessary reconnects. “Throughput Booster” or “Throughput Enhancement” — turn on if available. “Channel Width for 5GHz” — if the router supports 80MHz or 160MHz channels, match that here; if it’s set to 20MHz you’re capping yourself unnecessarily. These tweaks individually deliver 5-15% improvements; together with the bigger fixes above, they add up. You might also run into WiFi 6 Not Working in Windows 11.