I was wondering if anybody noticed an increase in speed in the compiled exe after the release of PB4.2 or WinXP SP3?

I ran a program which analyses 8000 lines of text and it usually took about 14 sec. to complete. Now, after installing SP3 for WinXP and recompiling my program with PB4.2 it merely takes 8 sec.
(the application for the most part does string comparisons)
What is responsible for this amazing speed enhancement? Does anybody know? Anyways, hats off!
Greetings, Mike