Use the official Microsoft ISO. If your PC feels slow, you can use safe tools like the Chris Titus Tech Windows Utility to optimize an official install without the risks of a pre-modded ISO.
Most "Kernel" OS builds have Windows Update disabled to maintain performance, meaning you’ll have to reinstall the OS to get new security patches. 4. How to Verify Your ISO kernel os windows 10 iso link
The Kernel OS is not a widely known operating system, but I assume you might be referring to the Windows Kernel or a custom kernel-based operating system. The Windows Kernel is the core part of the Windows operating system, responsible for managing hardware resources and providing services to applications. Use the official Microsoft ISO
Kernel OS removes background processes and telemetry to maximize hardware resources for gaming. FPS Optimization: Kernel OS removes background processes and telemetry to
The official source for (a custom, performance-tuned Windows ISO) is the KernelOS Official Website
, a popular custom, lightweight modification of Windows 10 designed specifically for gamers and power users who want maximum performance and minimum latency.