Generally the report processing and rendering are more expensive processes then the data retrieval. Thus our suggestion is to process and render the reports on the clients.
We have a variety of Data Source components available and you should choose the one that best fits your data source. Thus if your data source is SQL server our suggestion is to utilize our SqlDataSource component.
In order to improve the performance additionally when working with a lot of data our suggestion is utilize the report filtering functionality to reduce the report processing and rendering times and to ease the users in their report analysis.
the Telerik team
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