Mechanisms are provided for comparing the performance of applications. An application log record associated with a first application is identified. Mappings between the application logs and underlying log record of environments are made for both the source and the target environments. Performance measurements are made based on both the application logs in the source and target environments are made and compared to each other by way of the mappings. A result of the comparison is output to thereby compare performance of the first application in the source environment with performance of a second application in the target environment.