A performance management system, having a peer-to-peer architecture, enables performance transparency in computer information systems, providing granular performance data and scalability. Peer appliances in a computer information system collect performance data. When a user requests a performance report, an originating peer appliance may determine which peer appliances contain the data required for the report and what data processing, if any, is required. The originating peer appliance may send requests indicating what data and what data manipulation processing is required. Each of the receiving peer appliances (including the originating peer appliance) may perform its own portion of the data processing. The originating peer appliance may receive resultant data from the peer appliances (including itself) and combine the resultant data into the requested report for the user. The performance management system distributes significant data processing across the peer appliances, avoids bottlenecks, and increases system scalability.