I changed 6 settings on my Roku TV to significantly improve the performance
Briefly

Roku TVs may experience buffering, stuttering, or freezing, frustrating users. However, there are effective troubleshooting methods to restore functionality. First, unplug the device, allowing it to reset. If problems persist, restart via the settings menu or use a hidden remote command for a quick reboot. If specific apps cause issues, consider uninstalling and reinstalling them. By following these steps, users can improve their Roku's performance and enjoy uninterrupted streaming.
If this is happening on your Roku TV, don't give up on it just yet.
Rokus have caches that accumulate temporary data, which inevitably slows them down over time.
Sometimes it even does the trick. Unplug the unit, walk away for a few minutes to let all those electronic pulses fizzle out.
If you're having extra trouble with a particular app that you suspect might be causing problems, it's a good idea to uninstall and reinstall apps.
Read at ZDNET
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