Why is Skype using 100% of my CPU or more and how can I fix it?
I found this fix on a Skype community thread:


  Quit Skype, then in your home directory, look for a folder called Library/Caches/com.skype.skype and delete or rename that folder then start Skype... cpu usage should be back to normal.


If you can't find that folder, open your Terminal and simply type:

$ open ~/Library/Caches/com.skype.skype