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Wi-Fi speed is unusually slow

When troubleshooting particularly slow Wi-Fi speeds, it is important to rule out the causes one at a time. Based on the “Slow Wi-Fi” symptom, check for weak signal, interference, or 2.4GHz congestion before proceeding to the next step. Check the wireless adapter status, saved profiles, router/signal quality, and driver in order.

Solving Order
We've organized the methods starting with the simplest and least expensive ones. Please check the solutions one by one, starting from the top.

Do you have these symptoms?

  • wifi slow
  • low wireless internet speed
  • PC only wifi is slow

main causes

  • Weak signal/interference
  • 2.4GHz congestion
  • Driver/antenna problem

How to solve

Please check them in order from the top. If the issue is resolved, you do not need to proceed to the next step.

1

Check airplane mode and Wi-Fi status

First rule out that wireless is turned off or the adapter is disabled.

Difficulty Easy time 2-5 minutes cost 0 won
  1. 1Make sure Airplane Mode is turned off in Quick Settings.
  2. 2Turn Wi-Fi off and then turn it back on.
  3. 3Verify that the wireless adapter appears in Device Manager.

confirmation point

After these steps, see if the “Slow WiFi” symptom decreases or disappears. If there is no change, the possibility of weak signals or interference is also checked in the next step.

2

Forget Wi-Fi and reconnect

You can reset saved wireless profiles or password/security negotiation issues.

Difficulty Easy time 3-5 minutes cost 0 won
  1. 1Open Settings → Network & Internet → Wi-Fi → Manage known networks.
  2. 2Delete/forget the problem network.
  3. 3Select again and enter your password.
3

Reboot your modem and router and compare with other devices

Determine whether it is a PC problem or a router/line problem.

Difficulty Easy time 5-10 minutes cost 0 won
  1. 1Check if other devices, such as mobile phones, are connected to the same Wi-Fi.
  2. 2Turn off the modem/router for about 30 seconds and then turn it back on.
  3. 3Test your PC close to the router.
4

Check Wi-Fi drivers and power management

Driver instability and power saving settings can cause repeated disconnections and unresponsive adapters.

Difficulty Moderate time 15-30 minutes cost 0 won
  1. 1Check with your PC manufacturer for the latest Wi-Fi drivers.
  2. 2Check the power saving options in Device Manager → Wireless Adapter Properties.
  3. 3If the problem occurs after an update, consider rolling back the previous driver.
5

Use network initialization as the final step

Damaged TCP/IP, Winsock, and adapter settings can be restored to their initial state.

Difficulty Moderate time 15-30 minutes cost 0 won
  1. 1You can run ipconfig /flushdns, netsh winsock reset, etc. in the administrator terminal.
  2. 2If that doesn't work, consider resetting the network in Settings as the final step.
  3. 3Network programs such as VPNs and virtual switches may require reconfiguration after reset.

Frequently Asked Questions

We've put together a list of things we frequently check regarding this issue.

Related issues

If the symptoms do not match exactly, please check the issue below.

Internet

Problem with the Wi-Fi list or the Wi-Fi button itself not being visible

When troubleshooting the problem of not seeing the Wi-Fi list or the Wi-Fi button itself, it is important to rule out causes one at a time. Based on the “No Wi-Fi” symptom, check whether the wireless adapter is disabled, driver or hardware issue, and then proceed to the next step. Check the wireless adapter status, saved profiles, router/signal quality, and driver in order.

View solutions →
Internet

Wi-Fi connection keeps dropping

If you are experiencing the “WiFi keeps disconnecting” symptom, possible causes include power saving settings, driver instability, etc. Check the wireless adapter status, saved profiles, router/signal quality, and driver in order.

View solutions →
Internet

Unable to connect to specific Wi-Fi

If “Not connected to Wi-Fi” repeats, it is better to narrow the scope to saved profile errors and encryption/security mode compatibility rather than changing several settings at once. Check the wireless adapter status, saved profiles, router/signal quality, and driver in order.

View solutions →
Internet

Wi-Fi is connected, but Internet does not work

Among Internet problems, the “Wi-Fi connected but no Internet” symptom may be related to the router’s Internet line or DHCP/DNS problems. Check the wireless adapter status, saved profiles, router/signal quality, and driver in order.

View solutions →

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