If the video that you’re watching is lagging, try these troubleshooting steps:
．Check your internet connection. For better playback quality and effect, connect to an internet broadband that is faster than 500kbps.
．Pause to pre-load video. When the grey bar beneath the video finished loading, play again.
．Lower video quality settings.。
．If the video still has problem loading, clear caches and cookies on your browser then play again.