https://www.techradar.com/news/windows-10-lean-will-trim-the-features-for-better-performance-on-slower-devices

While we’re still waiting for the next major version of Windows 10 to be released, which now will apparently be called Windows 10 April Update, we’ve also seen evidence of new features that will come in later updates, including a new cut-down version of the operating system known as Windows 10 Lean.

According to a Twitter user named Lucas, Windows 10 Lean will be a new installation option when you install Windows 10 from scratch. The new edition is available in an early version of Windows 10, build (17650), which can be downloaded by Windows Insiders who have chosen the ‘Skip Ahead’ feature.