This version of MacSpeedo was calibrated for HyperCard 1.2.1, System 6.0 (System Tools 6.0.2), and Finder 6.1. (It makes little difference, but it's best to have the Control Panel cache on, and avoid MultiFinder.) Running it with a different configuration may produce misleading results. Editing any HyperCard stacks prior to testing may also affect results.