SAP BusinessObjects (BO) BI 4 Platform has come with many improvements that have made the system more complex. Rep-Up-GraphWe, as BI 4 administrators, are required to know how this application works in order to apply the proper optimization improvements to the platform, when it is required. In this blog article, we will cover the most important concepts that need to be considered as a first step to increase the performance of the BI platform. It is very important for a good designer to understand the conceptual tiers in the BI Platform: Application Tier, Intelligence tier and Processing tier. We will refer to each one of them and we will nail down some optimization tips.