CPF slows down SurfSpeed test?

Has anyone else noticed that CPF 2.3 seems to cause a significant slowdown on PC Mag’s SurfSpeed test? http://www.pcmag.com/article2/0,1895,1960252,00.asp
Using seat-of-the-pants reckoning, the office DSL seems only about 10% slower (almost certainly within sampling error), but at home the wireless connection was about 30% slower.