  The Large Area Telescope (LAT), the primary instrument for the Fermi
Gamma-ray Space Telescope (Fermi) mission, is an imaging, wide field-of-view,
high-energy gamma-ray telescope, covering the energy range from 30 MeV to more
than 300 GeV. We describe the performance of the instrument at the 10-year
milestone. LAT performance remains well within the specifications defined
during the planning phase, validating the design choices and supporting the
compelling case to extend the duration of the Fermi mission. The details
provided here will be useful when designing the next generation of high-energy
gamma-ray observatories.
