Windows 11's Weather app reportedly uses 5x more RAM than macOS's Weather app, with ads to boot
www.xda-developers.com
Hopefully, Windows K2 will fix it.

Summary

  • Windows 11 Weather app hogs about 1.2GB RAM and spawns multiple Chromium processes.
  • App displays ads because it wraps MSN weather in a WebView2/browser shell.
  • Native macOS Weather uses ~247MB with no ads; Microsoft should port to WinUI 3.