The invention relates to performance monitoring and relevant data display, and discloses a method and a system for providing data for a performance monitoring user interface. The method includes the steps: acquiring data definition generated in response to definition of the user interface; acquiring data from a data source according to the data definition; processing the acquired data according to the data definition; caching the processed data at a high speed. By the method and the system, the display speed of operational data corresponding to the user interface of a performance monitoring system can be greatly increased.