Monthly updates for Windows 11 from Microsoft now range from 4 to 9 GB, compared to 300 to 500 MB updates two years ago. The increase in update sizes is attributed to the integration of advanced AI features, cumulative delivery of updates, and a fixed monthly update schedule. Cumulative updates bundle all previous updates, leading to larger file sizes, while the monthly frequency forces consolidation of changes into single releases. Users can check what their PC is downloading during an update by navigating to Settings > Windows Update > Advanced options > Delivery optimization > Activity monitor.