📊Microsoft optimizes the WinUI 3 framework to improve Windows 11 performance. As you know, the company launched the Windows K2 initiative late last year to address core issues in Windows 11, and plans to migrate key OS components to the WinUI 3 framework. Microsoft has published GitHub updates on WinUI 3 improvements, aiming to make it the best native UI platform for Windows interfaces and apps, with performance improvements prioritized.

The team tested changes using File Explorer and Notepad to evaluate app startup metrics. Results showed memory allocations fell by 41 percent, short lived allocations fell by 63 percent, function calls fell by 45 percent, and WinUI code execution time improved by 25 percent. Microsoft plans to land these changes first in the Dev branch, then merge them into winui3/main.

Beth Pan, a Microsoft engineer, said the company coordinates with other Windows teams to ensure comprehensive improvements and described the work as long term, focused on strengthening fundamentals and raising system quality. Microsoft also tests a Low Latency Profile, which briefly raises CPU clock speed when users open apps, system popups, and context menus, to improve responsiveness.