Since version 2.0 of VLC a lot of changes were made in the code of this popular media player.
Something annoying was the increase of CPU usage when playing audio files. From almost 0% to 10-20%.
On powerful system this increase is almost unnoticeable, but on Intel Atom or AMD C60 you can notice the difference.
The fix is really easy.
Shutdown VLC and just erase/rename following 2 files from VLC folder (in my case C:\Program Files (x86)\VideoLAN\VLC\plugins\codec):
And this is all. CPU usage is back to normal.
I did not notice any problems for now.
Finally I can use again VLC on all my systems.