New Results Pongsakorn Wangkumhang, Matthew Greenfield, View ORCID ProfileGarrett Hellenthal doi: https://doi.org/10.1101/2021.08.12.455263 Abstract We present fastGLOBETROTTER, an efficient new haplotype-based technique to identify, date and describe admixture events using genome-wide autosomal data. With simulations, we demonstrate how fastGLOBETROTTER reduces computation time by 4-20 fold relative to the haplotype-based technique GLOBETROTTER without suffering loss of accuracy.