Clear your browser's cache, cookies and histories. Or update browser to solve it.
Or you can try this method if it don't work:
http://www.videoconverterfactory.com/tips/fix-youtube-videos-lagging.html
Servicio de atención al cliente por UserEcho
Clear your browser's cache, cookies and histories. Or update browser to solve it.
Or you can try this method if it don't work:
http://www.videoconverterfactory.com/tips/fix-youtube-videos-lagging.html