Performance of the CMS Fast Beam Conditions Monitor

The Fast Beam Conditions Monitor, BCM1F, is one among the beam conditions and radiation monitors installed in and around the CMS detector. It monitors the flux of particles with nanosecond time resolution and was designed to give a fast response being able to trigger possible harmful beam losses. Since November 2009, when the LHC restarted running with beams and providing proton-proton collisions, BCM1F has been recording data from beam-halo and collision particles. The performance of BCM1F during the last year of LHC operations is here presented.