In Qlikview, Application is automaitcally highly compressed while saving it. which is available in user settings -> save -> compression and there it will be high, normal , low. by default, it is already high. So, it is already compressed upto the max possible limits.
1. Understand the business logics and requirements to create the dashboard.
2. Fetch only those fields which required for analysis (i.e) when we fetch the data from table may be it will be having 15 fields, to create the dashboard we need only 7 fields and data of it, remaining 8 fields of data is not used at this situation we dont need of those fields and data for it, so in this case we can comment on those 8 fields.
3. Do limited load of data, for eg this will load first 1000 rows of data only, where you can do the design of dashboard and after finishing the dashboard you can do the full load of data;