I started using Ubuntu 14.04 and i had no problems with high cpu usage and watching videos, but after the recent update to 14.10 when i play a video on my file system .avi or .mp4 doesn't matter the file type, my pc starts lagging like crazy. When i write top in the terminal it says that vlc media player is using 185% of the cpu and compiz is using 125% of the cpu. As soon as i close the media player (every video player lags) my cpu usage goes down to about 30% and everything is normal. I updated my flash player and i ma using the optimal drivers for my nvidia video card. Watching videos in youtube also causes my cpu to go crazy but the playback does not lag.
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