blank white pages when pages are loaded

on my local site (1.7.4) i see a completely white browser screen for 1-3 seconds between page changes.. yet on this community site there are none.. instead of the 'gaps' between page renders, there is a fluid changeover.. 

does anyone know what i need to do to see similar behaviour on my site?

its not an issue of transfer speed since its running on my laptop..

a server config issue perhaps?

thanks