A method for searching a performance limit of an application chain implemented by an IT infrastructure including a plurality of devices, said method including the following steps: - firstly initiating a current measurement of the performance of said IT infrastructure, based on a current value of performance measurement parameters configurable via a configuration file, said configuration file setting, for each infrastructure device and for each resource of the application chain machines, a tolerance threshold, - firstly determining iteratively the performance measurement results of the devices and resources of the machines of the application chain of said IT infrastructure, the measurement results being relative to infrastructure performance parameters, - firstly comparing the measurement results with tolerance thresholds set in the configuration file for the infrastructure performance parameters in order to determine whether one or several threshold(s) is/are exceeded indicating that the infrastructure is not responding as expected, - firstly determining a modification margin of said current value of said at least one performance measurement parameter based on the results of said first comparison step, and based on said first determination of said modification margin, the steps of: - firstly modifying said current value of at least one of the performance measurement parameters based on at least one of a result of said first comparison and said first determination of a modification margin, and - re-performing the previous steps with said modified value or - firstly stopping said performance limit search, said performance limit being determined from said current value of at least one of the performance measurement parameters. - firstly initiating a current measurement of the performance of said IT infrastructure, based on a current value of performance measurement parameters configurable via a configuration file, said configuration file setting, for each infrastructure device and for each resource of the application chain machines, a tolerance threshold, - firstly determining iteratively the performance measurement results of the devices and resources of the machines of the application chain of said IT infrastructure, the measurement results being relative to infrastructure performance parameters, - firstly comparing the measurement results with tolerance thresholds set in the configuration file for the infrastructure performance parameters in order to determine whether one or several threshold(s) is/are exceeded indicating that the infrastructure is not responding as expected, - firstly determining a modification margin of said current value of said at least one performance measurement parameter based on the results of said first comparison step, and - firstly modifying said current value of at least one of the performance measurement parameters based on at least one of a result of said first comparison and said first determination of a modification margin, and - re-performing the previous steps with said modified value or - firstly stopping said performance limit search, said performance limit being determined from said current value of at least one of the performance measurement parameters.