Ingenio/SEOSAT is a high-spatial-resolution optical mission developed under the Spanish Earth Observation National Program for Satellites (PNOTS), and managed technically in the framework of an ESA contract. It features as Primary Payload (PP) a high-resolution optical payload with one 2.5 meter resolution panchromatic channel and four 10 meter resolution visible/near infrared spectral channels. It is based on a twin Korsch telescope concept, each telescope covering half of the instrument's swath width. At the present stage, the principal payload has undergone the vibration and environmental tests, and the final performance test campaign has been completed successfully. In this communication, we will present the main measured optical performance parameters, and its relation to predictions obtained from the different computer models. First, the payload's geometric performance is addressed in the paper, with focus on parameters such as the spatial sampling angle, detection line angle and distortion. On a second group, wavefront error and modulation transfer function are reviewed. Finally, radiometric performance is considered, with parameters such as radiance saturation levels and signal-to-noise ratios at defined minimum and reference radiances. All instrument performances have been measured at Thales Alenia Space in Cannes with set-ups developed specifically by Thales Alenia Space for Ingenio/SEOSAT ( i.e. Modulation Transfer function, straylight and radiometric measurements).