Since we have had no guesses so far I will put you out of your misery.
The first test (image1) was carried out with the web shield stopped, the second (image2) was with the web shield running. Whilst there is a bit of a difference I felt that it was well within the margins for error on these tests, so I ran it again with the web shield running, image3.
So I could say that my tests revealed that with the web shield running it is 40.60% faster test1 Vs test3, but I wouldn't as I know how fickle these tests are.
When I got my fast broadband installed I did a number of tests over several days to see just what my new connection would give, all of these tests were carried out with the web shield running. This image attached shows the fasted of the various tests I conducted.