Performance Navigator is a sophisticated graphical tool for PCs that focuses on analyzing performance and modeling capacity across diverse platforms such as IBM i, AIX/VIOS, Linux, Solaris, and HP-UX workloads hosted on IBM Power Systems, Oracle, and HP servers. This tool efficiently gathers historical performance data with minimal impact by securely transmitting information from collection services, NMON, and/or SAR to the Windows client on a nightly basis, ensuring that system history files are consistently updated. Users can benefit from an extensive array of graphs, tailored reports, and features that aid in performance evaluation, server consolidation, and system upgrades. One of the standout features is the "What If" functionality, which enables users to simulate various scenarios to assess the effects of capacity changes on server performance, thereby enhancing capacity planning accuracy. Furthermore, Performance Navigator excels in rapid problem identification, allowing users to receive detailed summaries of system problems in less than two minutes, which greatly aids in troubleshooting efforts. This robust support for multiple platforms makes it an invaluable tool for IT professionals.