Performance of the LHCb Detector during the LHC Proton Runs 2010-2012

The status and performance of the LHCb detector during the physics LHC physics run is described. The LHCb detector has a number of notable features including: 12 micron resolution in the transverse plane on 30-35 track primary vertices, pion and kaon separation from 1 to 100 GeV, and 1 MHz full readout of all sub-systems. The detector is being operating at twice its design Luminosity and the sub-system performance will be discussed. Hardware and software based trigger levels are utilised to efficiently select leptonic and hadronic decays of beauty and charm hadrons. During 2012 a so called ‘deferred’ triggering scheme has been used and will be presented. The alignment, tracking and particle identification performance will be discussed, together with effects of detector ageing.