ALICE FIT Data Processing and Performance during LHC Run 3

During the upcoming Run 3 and 4 at LHC upgraded ALICE (A Large Ion Collider Experiment) will operate a significantly higher luminosity collect two orders of magnitude more events than in 1 2. A part upgrade is new Fast Interaction Trigger (FIT). This thoroughly redesigned detector combines, one system, functionality four forward detectors used by during 2: T0, V0, FMD, AD. The FIT monitor background, provide feedback to LHC, generate minimum bias, vertex centrality triggers, real time. offline analysis data be extract precise collision time needed for time-of-flight (TOF) particle identification. heavy-ion collisions, also determine multiplicity, centrality, event plane. electronics designed function both continuous triggered readout mode. In these proceedings simulation, software, raw processing are briefly described. However, main focus on performance, trigger efficiencies, time, resolution.