in this case non-facet properties, category fields, category facets and "classification features" (like: size, colour...) are on the same solrindexedtype (which is now huge in entries) . In addition all the "classification features" have been added through another catalog in the form of hundreds of categories .I guess the problem here is this approach to index the big number in different features of the products.
May I ask what is the standard-approach to make a search fast here? Is there a guideline how to index products with many different features for a speedy search despite pumping it all into the same solrindexedtype? Is it normal to use categories and features interchangibly?