Abstract: A method and a computer program product for measuring and monitoring performance in a computer network environment that includes multiple clients and one or more servers providing one or more services is disclosed. The method includes monitoring the performance at each client based on true requests send to the servers over a network connection. The performance at each client is collected at a performance monitor database, where the collected performance data can be extracted to yield the performance of e.g. specific servers or services towards a specific client or a group of clients or the performance of a connection between a server and a client. The system performance is thereby measured at the clients where the system performance is actually utilized. The present invention thereby provides a more realistic scenario of the actual system performance than prior art systems based on monitoring server performance at the servers or through simulated clients.