I did my first test on September 19th, 2006 at about 12:00 A.M. CST (Midnight). The results:

The second test I did on September 27th at about 10:30 p.m. CST. The results:

(watch out the graphs colors are not the same)
What both graphs show is that AltaVista got the slowest pings. The first time I did this Google showed up as the fastest, but the second time MSN did. Yahoo always stayed second to fastest.
This is in no way the end of my tests. I have many more tests to do in order to find the fastest search engine. Next, I will check search time. After all tests are complete, I will post the information.