I was able to read this similar topic to get ideas
http://scn.sap.com/thread/1456755
Crystal with Subreport runs very slow in preview
However, I still did not get things working on my Crystal Report With Subreport in terms of speed. Here's the structure of the report.
I am using stored procedure as data source on my Main Report and Sub-report, Two reports are relatively similar, I just needed to apply the sub report method to achieve my desired output in having notes displayed at the group footer on each group, notes which consist of some records filtered from the details section.
The main report is basically displaying the sales of each tenant in different mall locations in a given months, selected by end-user (current month and previous month). They are grouped per mall location using group experts. As per filtering, there are 2 options which are:
a. ALL LOCATION and ALL TENANT (displays all records and grouped per crystal report viewing - SLOWEST loading)
b. ONE LOCATION and ALL TENANTS (less slower as it previews lesser records, but still slower than the usual)
In the main report, I used 10 parameters for it to display specific information for the report, so I also linked this 10- parameters PLUS ONE more, for the grouping information in the subreport, so a total of 11 parameters is linked from main report to the subreport.The sub report, also shares the same method of filtering with the main, basically when ALL LOCATION-ALL TENANT options is selected, both rpt file is loading the same differently, which is an obvious cause of the slow performance.
Based from the above links, it was suggested modify stored procedure and use in parameter, but this is quite vague being new user of the said function. Any help on this will be very much appreciated. Thank you in advance experts.