Portals build on dedicated platforms are aimed at high performance and optimization of the code.
This type of optimization is not only the optimization of the code implementing the server side, but also the amount of data downloaded from the server, scripts, photos and all sorts of other media.
Dedicated system sites are created with the intent to withstand heavy use for many users at once.
Dedicated software is use for programming specific customer needs can be efficient and fast.
Advantages:
Disadvantages: