In DSpace 7 User Interface development the initial focus was on replicating existing, pre-DSpace 7, features. While performance was taken into account for the development of individual features, it was not sufficiently covered from the perspective of DSpace as a whole. Given the End-of-life of DSpace 5 & 6 there was a need for swift structural performance optimization. In this presentation we elaborate on the performance issues that were encountered in DSpace 7, the possible solutions, and the remedies that are already developed, or that will likely be developed in the future. This presentation also briefly touches upon the importance of careful selection of custom development by decision makers.