Performance Envelope: The set of Pareto-optimal models — those that no other model beats on every axis at once. Highlighted points form the achievable frontier, and the surface is a smooth ceiling fitted over them: everything else lives underneath. Moving along the sheet means trading one dimension (cost, speed, quality) to gain in another. Smoothness widens the fit — low values follow the individual models, high values show the broad shape of the tradeoff. Switch to Faceted to see the raw triangulation, whose vertices are the frontier models themselves. Any axis can be set to log — useful for price and speed, which span orders of magnitude. Note that a log axis has to drop models whose value there is $0.00.