Methods, computer program products, and systems are presented. The method computer program products, and systems can include, for instance: testing a software application having instances that run on (a) a test computing environment and (b) a target computing environment, wherein each of the test computing environment and the target computing environment is provided by a mobile access edge computing (MEC) environment, wherein the testing includes varying a software application performance impacting parameter value impacting performance of an instance of the software application running on the test computing environment, and examining metrics data resulting from the varying the software application performance impacting parameter value; providing, in dependence on the metrics data, an action decision to adjust a software application performance impacting parameter value impacting performance of a software application instance of the software application running on the target computing environment; and adjusting the software application performance impacting parameter value impacting performance of the software application instance of the software application running on the target computing in accordance with the action decision.