Some users notice the change almost immediately. Wi-Fi was working normally, pages loaded quickly, and streaming felt smooth. After enabling Private DNS, however, websites begin opening slowly, apps pause while loading content, and speed tests suddenly show much lower results even though the Wi-Fi signal remains strong.
This situation often feels confusing because nothing appears wrong with the router or internet plan. In many cases, the slowdown is not caused by Wi-Fi itself but by how DNS requests are being handled after Private DNS is turned on.
Why This Happens
Private DNS forces your device to send domain lookups through a specific encrypted DNS server instead of using the one automatically provided by your network. Encryption improves privacy, but it also adds an extra step before any website or app can connect.
If the selected DNS provider is geographically far away, overloaded, partially blocked by the ISP, or unstable on mobile networks, every connection request takes longer to resolve. Because modern apps constantly request DNS lookups in the background, the delay quickly feels like slow internet speed.
In some networks, routers or carriers also perform traffic filtering that conflicts with encrypted DNS queries, causing retries or timeouts that reduce performance even more.
Step-by-Step Fixes
Switch Private DNS Back to Automatic
- Open Settings.
- Go to Network & Internet.
- Select Private DNS.
- Choose Automatic instead of a custom provider.
- Reconnect to Wi-Fi and test browsing speed.
If speed immediately returns to normal, the DNS provider was the bottleneck.
Try a Different Private DNS Provider
Not all DNS servers perform equally in every region. A provider that works well in one country may respond slowly elsewhere.
- Return to Private DNS settings.
- Select Private DNS provider hostname.
- Enter a different trusted DNS hostname.
- Reconnect Wi-Fi and test again.
Testing two or three providers usually reveals which one has the lowest latency on your network.
Restart Network Connections
After changing DNS settings, cached routes may still be active.
- Turn on Airplane mode for about 20 seconds.
- Turn it off and reconnect to Wi-Fi.
- Run a speed test or open several websites.
This forces the device to rebuild network sessions using the new configuration.
Check Router Compatibility
Older routers or ISP-provided gateways sometimes struggle with encrypted DNS traffic.
- Restart the router.
- If possible, update router firmware.
- Test Private DNS again afterward.
Alternative Solution
If Private DNS consistently slows your connection, consider leaving it on Automatic and using a secure DNS setting directly on the router instead. This keeps browsing stable while still improving privacy for all connected devices.
Once DNS resolution responds normally again, Wi-Fi speeds return to expected levels without further adjustments.