Thank you for pointing me this problem. This is the process which WordPress uses when you post something remotely, example via a blogging tool software. Currently I use Microsoft Windows Live Writer (WLW) as my blogging tool, it worked great before. I don't know why today it makes high CPU usage, maybe because I have posted a long post, which included many pictures, also at that time, WLW returned me an HTTP 500 internal server error.
This is the first time I meet this problem and it is not what I wish, of course. I think I should check Microsoft for fixing of this problem.
I hope you can unsuspend my account so I can continue to use your great service. Thank you very much.