Recently I installed ubuntu 9.04 on my computer.
All was fine except that it was using more cpu than usual.
I used top and system monitor to determine which process is using more than its normal share.
Unfortunately, I couldn't found any.
Thankfully I found this post.
According to it, the "vino" (VNC server) which comes installed with ubuntu is causing some problem.
So solution my friends (which worked for me) is to simply uninstall it.
I am simply writing this post to duplicate the solution so that this solution comes early in search results.
Thanks for reading and do comment if you find this useful.
Again your comments are important to determine the usefulness of this solution.