SQL SSRS Report optimization

Filtering the dataset might be slower than using the parameters when you are not using a cached report.

Filtering the dataset enables you to use a cached report that reuses the same data.

Filtering the dataset means that SQL Server Reporting Services will query all the data and later filter the information. The advantage of filtering the dataset is that other reports can use the same data when using cache reports, increasing their performance. However, if the report is not configured as cached, filtering the dataset will likely be slower than using parameters.