Telerik Reporting is an embedded reporting engine, which primary goal is to analyze data and represent it in a human-readable format that is also suitable for printing. During this process, certain complex layout and paging rules are applied, so the great flexibility offered by the reporting engine comes at a price: increased processing times and memory footprint. As far as the processing time and consumed memory is concerned, the complexity of the report layout, the complexity of the data calculations (aggregates, conditional formatting), the rendering media, the size of the generated document (in pages), and the capabilities of the underlying machine are crucial.
You should agree that dumping hundreds of thousands of records from a database at once hardly fit in the category of report generation and we anticipate that you would have low performance factor with any reporting engine.
Perhaps in your specific scenario another component such as our RadGrid control might be more appropriate, moreover our RadGrid control offers several export options.
All the best,
the Telerik team
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