Hi,
There are few performance metrics to be followed on reporting side as well DB side.
1. Document with many variables or many rows of data will take substantial amount of time to calculate. It is recommended to do the calculations at Universe level or DB level.
Ex: if report has 100,000 rows of data and 10 cols of formulas then report has to perform 100,000 * 10 before giving you the results.
Check the variables/context formulas in report.
2. Queries with Multiple context will generate multiple SQL statements . Document will merge the results of multiple queries then perform any calculations before rendering the document.
Check the SQL statements with merge queries.
3. Performance of the report is because of too much data display. Check Data Drilling /Hierarchies/Open Documents
There are many factors to improve the performance of the WebI Document and above mentioned are just few.
The rows of data you are trying to display is huge. perform the above metrics or move the detailed data to different tabs.
Also, there is option of scheduling to Excel or PDF.
Thanks,
Jothi