A computer-implemented method of reducing impact of performance data gathering on execution of instrumented code comprises gathering respective performance data for each of a plurality of routines in the instrumented code over a plurality of execution instances of the instrumented code. The method also comprises determining that the gathered performance data for the at least one selected routine follows an identified pattern for at least one selected routine from the plurality of routines and, in response to determining that the at least one selected routine follows an identified pattern, removing instrumentation associated with the at least one selected routine.