To improve poor video quality:

1. Adjust Video Resolution: Lower the resolution settings (e.g., from HD to SD) in the video player settings.
2. Check Internet Speed: Ensure a stable and fast internet connection.
3. Update Browser/Device: Use the latest browser or update your device's software for better performance.
4. Clear Cache: Clear browser cache and cookies to resolve playback issues.
5. Disable Browser Extensions: Temporarily disable extensions that might interfere with video streaming.