while playing videos and jump some location in video it takes some more time to jump that location?

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http://askubuntu.com – I have dell insprion n5010 500 gb hd,4gb ram 1gb intell HD graphics i installed ubuntu 12.10 i'm a new person to linux while playing videos the player keep on struggling also the system start up time is too slow. help to improve it I have dell insprion in that there is option to disable the battery charging in windows but in linux not how to enable this option (HowTos)