Netflix Keeps Buffering: How to Fix It in 2026

Step 1: Run a speed test

Verify your actual throughput, not just your plan speed. Netflix requires 15 Mbps for HD and 25 Mbps for 4K streaming. Run a speed test at speedtesthq.com to confirm you are meeting these thresholds. If your speed is below the requirement, address the internet speed issue first before troubleshooting Netflix specifically.

Step 2: Switch from Wi-Fi to wired Ethernet

Wi-Fi packet loss — even at high signal strength — causes Netflix's adaptive bitrate system to detect an unstable connection and drop quality or buffer. A connection can show 100 Mbps on a speed test but still have 1–2% packet loss that disrupts streaming. Connect your device to the router via Ethernet cable and test again. If buffering stops, the problem is Wi-Fi quality, not your internet speed.

Step 3: Change DNS to 1.1.1.1

Slow DNS resolution can delay Netflix startup and cause initial buffering as the app waits for CDN server addresses to resolve. Change your DNS to Cloudflare's 1.1.1.1 or Google's 8.8.8.8. On Windows: Network Settings > Ethernet or Wi-Fi > Properties > IPv4 > set Preferred DNS to 1.1.1.1. On a router: set DNS in the WAN or DHCP settings to apply to all devices.

Step 4: Sign out and back into Netflix

Netflix maintains server-side session data that can become stale or corrupted, causing playback issues that persist even across app restarts. Fully sign out of your Netflix account on the affected device, wait 30 seconds, and sign back in. This forces Netflix to assign a fresh session and CDN endpoint.

Step 5: Lower and re-raise playback quality

In your Netflix account settings online: go to Account > Profile & Parental Controls > your profile > Playback Settings > change from Auto or High to Medium. Save, then test streaming. If buffering stops at Medium, your connection cannot sustain High or Auto quality consistently. You can try raising it back to High after resolving other issues.

Step 6: Test on a different device

If buffering only occurs on one device — for example, a smart TV but not a laptop — the problem is device-specific. Common device-specific causes include: outdated Netflix app, insufficient device RAM or CPU for 4K decode, or a failing HDMI connection causing the device to downscale. Update the Netflix app on the affected device or try uninstalling and reinstalling it.

Step 7: Check Netflix server status

If buffering affects all devices simultaneously and started suddenly, check whether Netflix is experiencing a service disruption. Visit downdetector.com/status/netflix/ to see real-time reports. Netflix outages are rare but do occur, and no client-side fix will resolve a server-side problem.

Frequently Asked Questions

Why does Netflix buffer on fast internet?

Netflix can buffer on fast internet connections for several reasons unrelated to raw speed: Wi-Fi packet loss (even 1% causes adaptive bitrate to drop quality), slow DNS resolution delaying CDN connections, a stale session cache causing the app to connect to a suboptimal server, or a device-side issue like an outdated app or insufficient hardware decoding capability. Run a speed test, then switch to wired Ethernet to rule out Wi-Fi packet loss as the cause.

What speed do I need for Netflix 4K?

Netflix recommends 25 Mbps for Ultra HD (4K) streaming. However, Netflix's adaptive bitrate can deliver 4K at lower speeds by reducing the video bitrate — the image will still be 4K resolution but with more compression artifacts. For consistent, high-quality 4K with HDR, a stable 25 Mbps or faster connection is recommended. Note that this is 25 Mbps sustained throughput to the streaming device, not just your plan speed.

How do I stop Netflix buffering on Wi-Fi?

The most effective fix for Netflix buffering on Wi-Fi is switching to a wired Ethernet connection. If that is not possible: move closer to the router, switch to the 5 GHz band (less interference, higher speed at close range), check for Wi-Fi channel congestion using a Wi-Fi analyzer app, and restart the router. Also lower Netflix playback quality to reduce the sustained bandwidth required.