For all the things it does right, Windows 11 also has a pesky habit of making decisions for you that you don’t necessarily remember agreeing to. Some are harmless enough, while others quietly change how your PC behaves in the background. Somewhere in the middle of these two areas falls Delivery Optimization. Microsoft designed it to make Windows updates faster and more efficient by allowing your PC to get update files from other computers instead of relying entirely on Microsoft’s servers.