(IEEE) A requirement that imposes conditions on a functional requirement; e.g., a requirement that specifies the speed, accuracy, or memory usage with which a given function must be performed.
A performance requirement is a statement that describes how well a function is to be executed or achieved, or how well it is to be accomplished.
Any requirement established by the regulatory authority to ensure future compliance with the public health and environmental goals of the community. Performance requirements can be expressed as numeric limits (e.g., pollutant concentrations, mass loads, wet weather flows, structural strength) or narrative descriptions of desired performance, such as no visible leaks or no odors.
requirement that specifies a performance characteristic that a system or system component must possess; for example speed, accuracy, frequency.
A system/software system requirement specifying a performance characteristic that a system/software system or system/software component must possess; for example, speed, accuracy, and frequency.