Webhancer is a web siteperformance analysis program that may be installed on your computer without your knowledge. I found webhancer installed on my system unbeknownst to me. As a consumer this incensed me as it was installed subversively and alters my windows network stack. I'm sure this doesn't improve performance either and appears to cause additional problems.
I initially went looking for background programs that might be causing network related problems I had observed. Every time I launched RealOne Player from Mozilla it would freeze for several minutes before playing the audio. Now that webhancer is removed it seems this problem is also gone. If I notice the problem again and Webhancer has not re-installed itself I will publish a retraction.
I'm not sure which programs are shipping with and installing Webhancer. Refer to Webhancer Spyware to detect and remove it.