1. A system for identifying tool parameter impact on tool performance in a semiconductor fabrication system, comprising: at least one non-transitory computer-readable medium having stored therein computer-executable components; and at least one processor that executes the following computer-executable components stored on the at least one non-transitory computer readable medium: a parameter separation component configured to generate a set of functions that respectively characterize a behavior of a tool performance indicator in terms of a single tool parameter from a set of tool parameters; a ranking component configured to rank the set of tool parameters according to a relative impact on the tool performance indicator to yield a parameter ranking, wherein the relative impact is determined based on the set of functions; and a filtering component configured to identify a subset of the tool parameters having a significant impact on the tool performance indicator based on the parameter ranking.