I am playing around with the Modular Theme in WPS 7002 for last few days and one thing that i noticed is the new theme is quite past compared to the older theme. So i was trying to figure out what is going on and it seems IBM used one simple trick(In addition to lot of more complex stuff like combining of resources,.. etc) to speed up the page.
If you load a portal page in the browser and use firebug to look at the requests you will notice that it is loading 24 files. Please note that i am using Disabling combining of resource for debugging modular theme settings so every file gets loaded separately so that i can debug and figure out what is going on. If you have not disabled combining of resources you will see very few requests but little less amount of data will be downloaded from the server