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Sometimes—but there is no one setting that fixes every slow Wi-Fi problem. If your router offers airtime fairness, it can limit how much shared wireless time slower clients use, potentially helping faster devices. The tradeoff is that those older or slower devices may get less time themselves. Try it only if the setting is available on your router, then compare results before and after.
Can an old Wi-Fi device slow down the rest of the network?
It can affect other clients sharing the same wireless radio. Devices take turns using Wi-Fi; when a client transfers data slowly, it can occupy the radio longer to move the same amount of data. That can leave less opportunity for faster clients. An old device is not automatically the cause of a slowdown, though: weak signal, distance, walls, interference, channel congestion, and band or channel-width compatibility can also matter.
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Airtime fairness is a router feature intended to manage how that shared wireless time is divided. It does not add internet capacity or make an old device faster. Depending on the router and network, it may improve efficiency or faster clients’ performance while reducing the slower client’s access to airtime.
What airtime fairness changes—and what it costs
Wi-Fi clients contend for opportunities to send and receive data. A slow transmission can take longer, so faster clients may wait. Airtime fairness attempts to distribute radio time in a way that prevents slower clients from occupying a disproportionate share.
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That balance can come at the slower device’s expense. TP-Link’s Archer AX20/AX1800 V1 guide describes its Airtime Fairness setting as improving overall performance “by sacrificing a little bit of network time on your slow devices.” This is the guide’s description of that product, not a guarantee of the same result on every router.
TP-Link Omada’s support document illustrates the possible tradeoff with a vendor example: with airtime fairness disabled, it reports 28.075 Mbps download for an 802.11g client and 18.521 Mbps for an 802.11n client; with the feature enabled, it reports 12.214 Mbps and 116.538 Mbps, respectively. The example’s reported total Wi-Fi throughput rose from 46 Mbps to 128 Mbps. These are TP-Link’s example-test results, with no publication year stated on the document—not independent measurements or a prediction for your home. TP-Link Omada: What is Airtime Fairness?
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Router implementations also differ. NETGEAR documents an implementation that distributes 80% of network bandwidth equally across up to 50 wireless devices, with remaining clients sharing the other 20%. That is a policy for the NETGEAR implementation described on its support page; it should not be treated as a universal airtime-allocation rule. NETGEAR: Airtime Fairness
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- Identify your router model and firmware. Check the label, router app, or administration page, then consult the instructions for that exact model. Not every router offers airtime fairness, and menu names and defaults vary.
- Record a baseline before changing anything. Test the device you suspect is slow and at least one faster device. Check more than one location, including where Wi-Fi usually causes trouble. Note both speed and whether devices stay connected. Microsoft recommends testing before and after network changes; keep the location and conditions as similar as possible. Microsoft: Fix Wi-Fi connection issues in Windows
- Enable airtime fairness if your router has it. For the TP-Link Archer AX20/AX1800 V1 guide, the path is Advanced > Wireless > Additional Settings. That path is specific to the cited model and guide; other routers may place the control elsewhere or omit it. TP-Link Archer AX20/AX1800 V1 User Guide
- Repeat the same tests. Compare the slower device’s speed and reliability, the faster device’s performance, and how the network feels during ordinary use. Change one setting at a time so you can tell whether airtime fairness helped.
- Keep or undo the change based on your results. If faster devices do not improve, or older devices become unreliable, restore the original setting and investigate other causes.
Check other causes if airtime fairness does not help
Band choice and the radio environment often matter as much as device age. Microsoft describes 2.4 GHz as broadly compatible and longer-range, but generally slower and more congested; 5 GHz generally offers faster throughput and less congestion, but shorter range. 6 GHz requires compatible Wi-Fi 6E equipment and is unsupported by many older devices. A router may combine bands under one network name, so the options you can choose depend on the router and client.
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- Signal and placement: Distance, walls, and other obstacles weaken the signal. Test closer to the router to see whether location is the problem.
- Interference and congestion: Busy wireless channels can slow connections. Where your router supports channel selection, a less congested channel may help.
- Channel width and older adapters: Microsoft notes that some older adapters or drivers may not work well with 40 MHz channel width on 2.4 GHz. Compatibility depends on the particular router, adapter, and driver.
- Wi-Fi 6 compatibility: If an older IoT device has trouble connecting to a Wi-Fi 6 router, consult guidance for that router rather than turning off features blindly. ASUS lists options such as Wi-Fi 6 mode, Wi-Fi Agile Multiband, Target Wake Time, and Protected Management Frames as possible compatibility steps for certain supported models. Its page was last updated July 22, 2024; the listed steps are not a universal checklist. ASUS: Troubleshooting for IoT device compatibility issues with ASUS Wi-Fi 6 routers
ASUS also documents wireless settings for supported models, but its available controls and navigation depend on the device and firmware. ASUS: How to set up the wireless router to work with 2.4GHz and 5GHz WiFi
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