Development and deployment of a fast Monte Carlo simulation in LHCb

With the steady increase in the precision of flavour physics measure-ments with data from Run 2 of the LHC, the LHCb experiment requires simulateddata samples of ever increasing magnitude to study the detector response in detail.However, relying on an increase of computing resources available for the produc-tion of simulated samples will not suffice to achieve this goal. Therefore, multipleefforts are currently being investigated to reduce the time needed to simulate anevent. This document presents a summary of those efforts in LHCb, focusing onthe newest developments: re-using parts of previously simulated events and a fullyparametric detector description using the DELPHES framework.