Your smart TV can stream 4K movies, run apps, and browse the web — but when a show starts buffering, how do you figure out what's wrong? Running a speed test directly on your TV tells you exactly how fast your connection is at the device itself, not just at your router. Here's how to do it on Samsung, LG, and Vizio smart TVs, step by step.
Why Test Speed on Your TV Instead of Your Phone?
You might wonder why you can't just run a speed test on your phone and call it a day. The problem is that your phone and your TV often get different speeds — even on the same Wi-Fi network. Your phone might be closer to the router, use a newer Wi-Fi chip, or connect on a different frequency band.
Testing on the TV itself gives you the real number that matters for streaming. If Netflix recommends 25 Mbps for 4K and your TV is only pulling 8 Mbps, you've found the bottleneck. That information is way more useful than knowing your phone gets 150 Mbps in the next room.
Common reasons your TV gets slower speeds
- Distance from the router — TVs are usually in living rooms, which may be far from the router.
- Older Wi-Fi hardware — Many TVs still use Wi-Fi 4 or Wi-Fi 5 chips, while newer phones use Wi-Fi 6 or 6E.
- No external antenna — TVs have small internal antennas that can't match a laptop or phone.
- Wall interference — Brick, concrete, or metal between the router and TV kills signal strength.
If your results look low, check out our guide on why your internet might be slow for more troubleshooting steps.
How to Run a Speed Test on Samsung Smart TVs
Samsung's Tizen operating system has a built-in web browser, which makes testing easy. There are two methods you can use.
Method 1: Use the built-in browser
- Press the Home button on your Samsung remote.
- Navigate to Apps and open the Internet browser (it's pre-installed on most Samsung TVs from 2016 onward).
- Type speedtest.now into the address bar and press Enter.
- Click the "Go" or "Start" button to begin the test.
- Wait about 30 seconds for your download speed, upload speed, and ping results.
Method 2: Check your network status
Samsung TVs also have a basic built-in network test. Go to Settings → General → Network → Network Status. This will tell you if your TV is connected and show basic connection info, but it won't give you actual speed numbers in Mbps. For real speed data, the browser method is better.
Tips for Samsung TVs
If the browser feels slow or won't load, try clearing the browser cache first: open the browser, go to Settings → Privacy & Security → Delete Browsing Data. Samsung TVs from 2015 and earlier may not have a browser at all — in that case, you'll need to use a streaming device like a Fire Stick or Roku to test.
How to Run a Speed Test on LG Smart TVs
LG's webOS platform also includes a web browser, and the process is similar to Samsung.
Step-by-step instructions
- Press the Home button on your LG Magic Remote.
- Find and open the Web Browser app from the app bar at the bottom of the screen.
- Type speedtest.now in the URL bar at the top.
- Click the start button once the page loads.
- Your results will appear in about 20–40 seconds.
LG's built-in network check
Like Samsung, LG has a network diagnostic tool. Go to Settings → All Settings → Network → Wired/Wi-Fi Connection. You'll see your connection status and signal strength, but again, no actual speed measurement in Mbps. Stick with the browser for real numbers.
If your ping (the time it takes data to make a round trip to a server) shows up higher than 50 ms, that could explain lag in live TV apps or gaming. You can learn more about what those numbers mean on our good ping guide.
How to Run a Speed Test on Vizio Smart TVs
Vizio is trickier. Most Vizio TVs running SmartCast don't have a built-in web browser. That means you can't just open a website and run a test directly on the TV. But you still have options.
Option 1: Use a connected streaming device
If you have a Roku, Amazon Fire Stick, Apple TV, or Chromecast with Google TV plugged into your Vizio, you can use that device's browser or speed test app. On Fire Stick, for example, you can download the Silk or Firefox browser and visit speedtest.now.
Option 2: Cast from your phone
Since Vizio SmartCast supports Chromecast built-in, you can run a speed test on your phone while it's on the same network your TV uses. This won't test the TV's Wi-Fi chip directly, but it gives you a close estimate of what that network connection delivers.
Option 3: Check Vizio's network info
Go to Menu → Network → Test Connection. Vizio will check if the TV can reach the internet and may show signal strength. On some newer models, it briefly shows estimated speeds, but it's not a full test.
What Speeds Do You Actually Need?
Once you've got your results, here's how to read them. The table below shows the minimum download speeds you need for popular streaming services at different quality levels.
| Streaming Service | HD (1080p) | 4K UHD | 4K HDR/Dolby Vision |
|---|---|---|---|