This paper presents the results of the end-to-end performance verification campaign performed in the frame of the COSMO-SkyMed system commissioning. After a brief introduction that provides an overview of the context in which the activity has been developed, the paper describes the reference parameters that have been individuated in order to evaluate the COSMO-SkyMed system performances and shows as these parameters have been used in the frame of the verification of system compliance with reference to the applicable requirements. The tests performed to measure these relevant parameters together with a description of the related scenarios and general conditions and constraints are presented. Finally the paper reports the achieved results and associated conclusions.