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These are high priority targets for optimization and will be taken up with RMsis 1.9.x series (after 1.9.0 release). Meanwhile, users are advised to choose a smaller data set to perform these operations.
PDF Generation
[Pritam] Should we add data for the worst case performance ?
Custom Report Generation
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However, CSV import still slows down considerably for MySQL in default configuration, when certain tables hit the limit of around 1 million rows. The fix requires considerable change in database design and is planned to be addressed in RMsis 1.9.x series (after 1.9.0 release).
CSV Export
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