If you want in-depth help from Support, don't waste Support's time responding to baseless criticism of the product. This is the second time you've done so and rather than further help, the only result in going to be getting ignored.
Support already gave you an approach:
To elaborate: a tree facet with 25,000 nodes showing every single customer is a terrible UI, and will result in the user navigating forever to find the data they actually want to see, all the while loading data they don't actually care about, which slows down the application for all users.
Instead, *before showing the cube*, provide a UI that allows the user to select specific customers to display. This is more usable and more efficient.
In sum, the cube doesn't support lazy loading of facet values by default because that's a really bad UI with poor performance.
Support already gave you an approach:
some kind of filtering before showing the cube as such, which again would generally be a better UI, as well as more efficient.
Instead, *before showing the cube*, provide a UI that allows the user to select specific customers to display. This is more usable and more efficient.
In sum, the cube doesn't support lazy loading of facet values by default because that's a really bad UI with poor performance.
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