This is a classic case of Sub-Optimally designed Qlik apps leading to poor performance. Qlik is an in-memory BI tool but that doesn't mean that increasing the RAM is the answer for solving performance challenges, rather optimizing the code (Backend as well as UI level) can help you improve this. We, at Polestar, offer our Qlik Health Check services to assess the existing Qlik setup and identify the root cause and resolution for the persisting issues.