InfoSources, transformations and performance

Hi

The scenario is: Load from DSO to Cube. The Cube has KFs that are not in the DSO and we want to have all logic in the start and/or end routine.

A solution to the problem could be to add an InfoSource in between the DSO and the Cube the InfoSource should have all fields from both DSO and Cube. The down side to the solution is that there will be an extra transformation (even though its 1:1) between the DSO and the InfoSource. Is there any one that have measures on what kind of performance impact a design like this would have?

With Kind Regards

Kristian App