How to Speed Up a Slow Smart TV

Smart TVs slow down over time as cached data accumulates, apps go unupdated, and storage fills up. Before you replace the TV, try these fixes that take about 15 minutes total.

Clear the App Cache

Every streaming app stores cached thumbnails, previews, and temporary data. On most TVs:

Samsung: Settings > Support > Device Care > Manage Storage. Select apps individually and clear cache. Or Settings > Apps > select app > Clear Cache.

LG (webOS): Press and hold the Home button, go to the app, press the up arrow, and select Close. LG does not expose cache clearing directly, but closing apps fully (not just switching away) releases memory.

Android TV / Google TV: Settings > Apps > See All Apps > select the app > Clear Cache. Do this for Netflix, YouTube, Hulu, and any other streaming app you use.

Roku: No direct cache clearing. Instead, do a system restart: Settings > System > Power > System restart. This clears temporary files.

Delete Unused Apps

Every installed app consumes storage and may run background processes. Delete anything you do not actively use. Most smart TVs have only 8 GB of storage, and once you pass 70% capacity, performance drops noticeably. Navigate to your app list, highlight unused apps, and uninstall.

Restart the TV (Actually Restart)

Pressing the power button on most smart TVs puts it in standby, not a full shutdown. To actually restart: unplug the TV from the wall, wait 30 seconds (this drains residual power from capacitors and clears volatile memory), and plug it back in. On Samsung, hold the power button on the remote for 6 seconds until the TV restarts.

Do this weekly. A full restart clears memory leaks from apps that do not release RAM properly.

Update the Firmware

Manufacturers release firmware updates that fix performance bugs. Settings > Support > Software Update > Update Now (Samsung). Settings > All Settings > Support > Software Update (LG). Settings > System > About > System Update (Android TV).

Enable auto-updates so you do not fall behind. Firmware updates sometimes fix specific buffering and lag issues that no amount of cache clearing will solve.

Use Ethernet Instead of Wi-Fi

Smart TVs have notoriously weak Wi-Fi antennas. If your TV is within 15 feet of your router, connect an Ethernet cable. This eliminates buffering caused by Wi-Fi congestion, especially in apartments. If running a cable is impractical, use a powerline adapter ($30-$50) that sends internet through your home’s electrical wiring.

When to Buy a Streaming Stick Instead

If your TV is more than 5 years old and still sluggish after all the above, the processor is simply underpowered for modern apps. A Roku Streaming Stick 4K ($35), Amazon Fire TV Stick 4K ($35), or Chromecast with Google TV ($30) plugs into an HDMI port and bypasses the TV’s slow built-in software entirely. Use the TV purely as a display and the stick for all your apps.

This is cheaper and more effective than buying a new TV, and the sticks receive software updates for years.

Factory Reset as Last Resort

If none of the above steps improve performance, a factory reset clears all accumulated cache, failed installations, and corrupted settings. Navigate to Settings, System, Reset, Factory Reset. You will need to re-enter streaming passwords and reconfigure preferences, but the TV will perform like new. Particularly effective on TVs more than 2 years old.

Bottom Line

Clear app caches, delete unused apps, do a full unplug-restart weekly, and update firmware. If the TV is still slow after all that, spend $35 on a streaming stick instead of $500 on a new TV.