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This work describes the optimization and parallelization activities performed on the OASIS3 coupler. The test case used for evaluating and profiling the coupler consists on the CMCC-MED coupled model developed by the ANS division of the CMCC and currently in production on the NEC SX9 cluster. The experiments highlighted that the most time consuming transformations are the extrapolation of the fields on the masked points (performed in the extrap function) and interpolation (performed in thedoi:10.2139/ssrn.1474280 fatcat:iyjha63bynbpnfag3wygpownim