When installing new updates via Windows Update or the Microsoft Store, Windows 10 can consume all of the available Internet bandwidth. A Windows 10 feature can allow you to specify how much bandwidth these update processes can use so that it does not affect other programs. With this setting enabled, when Windows 10 performs an update, it will only use the specified amount of bandwidth and thus allow other applications to continue using the Internet without issues. It should be noted that decreasing the bandwidth available for updates will also cause these updates to download slower.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-limiting-the-bandwidth-used-by-windows-update/