I have tried other business inntelligence software before and i wanted to understand how qlik sense can be so fast even with large amounts of data that slowed down other programs.
I would also like to know if Qlik Allerting, Qlik GeoAnalytics, Qlik Core, Qlik Compose.... are all add-on programs that I can purchase to improve the user experience.
The associative engine is where the real magic happens. The details of how it operates are of course a trade secret, but this page provides some information:
In particular, this data sheet might be of interest to you as it gives a high level description of how the engine differs from most other technologies:
