Don't know its a system specific problem or something else but editing the httpd.xampp.conf file did helped me to make it super-fast load on local environment, faster than a server where my website is hosted.
Doing a development on windows using XAMPP with default install on windows can give you a nightmares due to its dead slow speed of processing.
I too had same issue of slow processing speed on XAMPP.
I too did a lot of googling for solution to increase the speed.
At most of the places its showed...