|This is only if you are opening a video on your PC:|
With the video window open, try ctrl/alt/delete and when the task manager comes up go to processes and right click on the player you are using. Set the priority to high and see if that helps.
I think what you mean is that the online video keeps buffering, am I right?
If that's the case you may not have enough ram or maybe your connection is too slow.
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