Atlas removes massive amounts of bloatware, disables power-saving features that choke CPU performance, and optimizes the Windows thread scheduler. Their GitHub repository is fully open-source, allowing advanced users to audit every single modification made to the OS.
. However, choosing the "best" one depends on whether the priority is maximum performance (at the cost of stability) or a balanced, secure experience. Top Custom Windows 10 ISOs for Gaming (2026) best custom windows 10 iso for gaming
Ghost Spectre is one of the most famous names in the custom Windows scene. It offers a "Superlite" version that strips Windows down to its absolute bare essentials, providing massive performance uplifts for low-end hardware. Atlas removes massive amounts of bloatware