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OSX-Optimizer is a collection of shell-based tweaks for macOS designed to speed up boot time, improve perceived performance, and reduce unnecessary background activity, especially in virtualized environments. The README emphasizes that macOS can be heavily modified using the defaults command, and many of the optimizations are simply well-chosen combinations of defaults and system utilities. It shows how to capture and compare system preferences before and after GUI changes (using defaults read and diff) so that users can understand which keys to automate. The script collection includes aggressive adjustments like skipping the GUI login screen, enabling performance mode via NVRAM flags, and disabling large wallpapers and visual effects to reduce graphical overhead. ...