A method for dynamic real-time optimization of the performance, in particular of the power output, of a wind park, wherein the wind park comprises a plurality of wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g), the method comprising the steps of: a) providing, for a plurality of subsets (12a, 12b, 12c, 12d, 12e) of the wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) of the wind park, a mapping of a data vector to a target parameter, said target parameter being indicative of the performance of the subsets (12a, 12b, 12c, 12d, 12e) of the wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g), said data vector comprising wind condition data and operational parameters for the wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) of the subsets (12a, 12b, 12c, 12d, 12e) of wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g), b) selecting a subset (12a, 12b, 12c, 12d, 12e) of the plurality of subsets (12a, 12b, 12c, 12d, 12e) of wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) for optimization, c) determining the wind condition data for the selected subset (12a, 12b, 12c, 12d, 12e) of wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g), d) determining the operational parameters for the wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) of the selected subset (12a, 12b, 12c, 12d, 12e) by at least one of - selecting operational parameters which maximize or minimize the value of the target parameter for the determined wind condition data, and/or - selecting operational parameters for which the value of the target parameter for the determined wind condition data is unknown, the method further comprising the steps of e) applying the determined operational parameters to at least one of the wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) of the selected subset (12a, 12b, 12c, 12d, 12e), f) after a first time interval, measuring posterior wind conditions and determining a posterior value of the target parameter for the selected subset (12a, 12b, 12c, 12d, 12e), g) updating the mapping with the posterior wind conditions and the posterior value of the target parameter of step f) for the applied determined operational parameters, and h) repeating, after a second time interval, steps b) to h), wherein the determined operational parameters for the wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) of the selected subset (12a, 12b, 12c, 12d, 12e) and the values of the target parameter are determined by a data-driven method and not determined based on physical models or technical models or weather models or external forecasts or simulations. a) providing, for a plurality of subsets (12a, 12b, 12c, 12d, 12e) of the wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) of the wind park, a mapping of a data vector to a target parameter, said target parameter being indicative of the performance of the subsets (12a, 12b, 12c, 12d, 12e) of the wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g), said data vector comprising wind condition data and operational parameters for the wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) of the subsets (12a, 12b, 12c, 12d, 12e) of wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g), b) selecting a subset (12a, 12b, 12c, 12d, 12e) of the plurality of subsets (12a, 12b, 12c, 12d, 12e) of wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) for optimization, c) determining the wind condition data for the selected subset (12a, 12b, 12c, 12d, 12e) of wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g), d) determining the operational parameters for the wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) of the selected subset (12a, 12b, 12c, 12d, 12e) by at least one of - selecting operational parameters which maximize or minimize the value of the target parameter for the determined wind condition data, and/or - selecting operational parameters for which the value of the target parameter for the determined wind condition data is unknown, the method further comprising the steps of - selecting operational parameters which maximize or minimize the value of the target parameter for the determined wind condition data, and/or - selecting operational parameters for which the value of the target parameter for the determined wind condition data is unknown, e) applying the determined operational parameters to at least one of the wind turbines (10, 10a, 10b, 10c, 10d, 10e, 10f, 10g) of the selected subset (12a, 12b, 12c, 12d, 12e), f) after a first time interval, measuring posterior wind conditions and determining a posterior value of the target parameter for the selected subset (12a, 12b, 12c, 12d, 12e), g) updating the mapping with the posterior wind conditions and the posterior value of the target parameter of step f) for the applied determined operational parameters, and h) repeating, after a second time interval, steps b) to h),