Data Pages are asynchronous load, so when it is referenced it would be loaded. If you have multiple drop-downs referring the different data pages in the same section, then based on the configuration the screen rendering or data fetching would take time. You can probably think of using on-hover load kind of options for some of the drop downs, or some of the data pages can be pre-loaded by just referencing them in some rule in the process. I do not see a value add with the wrapper data page which you are asking.