Waterfalls and Performance
Waterfall output is generated every time a PSP procedure executes. For example, when the user clicks a Net Price to display its waterfall, that record is repriced and fresh waterfall output is generated for display. This process keeps the waterfall output and net price in sync. This process requires minimal overhead, because it is done in memory.
If a line item is read-only (for example, because it has already been submitted as an order), then it is not possible to reprice the item. In this case, the waterfall virtual business component looks for saved waterfall output for that line item and the waterfall displays that saved waterfall output instead.
Waterfall output is only saved to the database upon user request. Writing waterfall records to a database can be costly. The waterfall records are written in the background to minimize end-user latency. For more information, see Saving Waterfall Data.