I'm not sure what you are saying.
This is very simple - imagine you have a game v1.2 that works. The developer releases an update v1.3, you install it, and it does not work. The new version was poorly designed and/or tested.
The app store app on the ipad is the same, except we don't choose to update it. The app store installed under IOS5 is different from IOS6 - they look completely different and are different programs. So, yes, the new version of the app store app does have processing problems based upon the number of apps you have purchased and the network speed. Even though under 6.1 I can now pull up 1200 apps under purchased apps on my ipad using IOS6 - I have trouble on busy / free networks like McDonald's sometimes. My other ipad using IOS5 has never had a problem with the same number of apps (same Apple ID obviously) and works fine even on slow networks.
So, the problem is that the IOS6's version of the app store app cannot handle a large amount of purchased apps.
I really don't like the look of the new app store installed under IOS6, and frankly hate the new itunes on the PC (downloads are hidden, no cover art shows in the lower left corner, need to toggle left pane). The basics of softrware development are design to meet user requirements (they clearly did not gather any), then protype, test, debug, etc. -- and only then release.
Change just to make things "different" is not innovation.