For a few weeks, it seemed like my internet was slowing down, especially when I had the most work to do. This happened in the middle of large downloads or on Discord calls. It got more confusing because internet speed tests looked fine, and I assumed it was safe to rule out a Windows issue. I started blaming my ISP because restarting the router would temporarily fix it. After about a week of investigation, I traced this issue to the Delivery Optimization feature on my computer. I’ll show you why it was a problem and how I fixed it. What Delivery Optimization was doing behind the scenes Windows was sharing update data long after updates had finished downloading Afam Onyimadu / MUO Delivery Optimization is a useful feature of Windows. It allows your PC and other computers on the same network to download or share portions of updates and apps, rather than downloading the entire thing from Microsoft’s servers. However, you will not see any notifications or taskbar icons when your device is uploading fragments …