Since its demonstration as the world’s first hard X-ray Free-Electron Laser (XFEL) in 2009, the Linac Coherent Light Source (LCLS) at SLAC has been producing coherent beams of X-rays with unprecedented brightness and temporal resolution.  Delivering more than 10¹² photons in each ~50-fs pulse at X-ray energies up to 11 keV, the LCLS has enabled new, unique scientific studies ranging from single-shot femtosecond diffractive imaging, to split-and-delay, pump-probe dynamic experiments.[i]  In this talk, I will present the recent electron beam and X-ray performance of the LCLS.  I will cover its main mode of operation, namely self-amplified spontaneous emission (SASE), as well as the self-seeding methods to improve the radiation temporal coherence.  These self-seeding methods have been used to reduce the relative spectral linewidth in both the hard and soft X-ray regions, from the typical 0.2% SASE bandwidth to less than 10^-4.  Other advanced features such as the fresh-slice lasing and two-color lasing will also be discussed.  Finally, I will briefly describe the LCLS-II project which involves major upgrades to the SLAC linac and undulators.  LCLS-II will incorporate a brand new 4-GeV superconducting linac to enable high-repetition-rate operation, up to a million X-ray pulses per second, at X-ray energies up to 5 keV.[ii]  In addition, two brand new variable-gap undulators, driven with electron bunches from both the existing copper linac and the new superconducting linac, will allow the LCLS-II to cover a broad X-ray energy range from 0.2 to 25 keV.  Scheduled to come on line by 2019, the LCLS-II is expected to provide unprecedented x-ray properties, through control of spatial, temporal, and energy resolution that will enable groundbreaking research in a wide range of scientific disciplines, from advanced materials to energy research and life sciences.