All kind of video does not play smooth or else it lags badly on my late macbook pro i7 Quad core 2.4 Ghz, 4GB Ram help me

i am having this problm badly , as i am freelace Video Editor for that i have to show the video work to my clients and when i play MP4,AVi,Mk4,Mpeg, or all kind of video formates it lags while playing
what to do ?
although it's the high conf. machine in macbook pro segment
however it does not play VIDEO

Hey Cris from London,
I would try out the recommended steps in the following link:
OS X Mavericks: If your Mac runs slowly
http://support.apple.com/kb/PH13895
Let us know if any of the steps within resolved the issue.
Welcome to Apple Support Communities!
Take care,
Delgadoh

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