video lags in dual screen

squirrel

Geek Trainee
i have a sony vaio with a i5 and 4gb ram

when i play video through vlc or any other player through my monitor while using my laptop screen at the same time the video lags. When i play video through just my monitor everything is fine.

i thought that an i5 can support dual monitors easily? is there a reason for the lag?
 
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