The weirdest Windows 11 slowdowns still come from features that should have died years ago

Windows 11 performance issues in 2026 are largely caused by legacy architectural holdovers rather than new features. Key culprits include the modern context menu's dependency on the legacy Explorer shell (causing right-click lag), Virtualization Based Security (VBS) imposing a 5–15% gaming performance penalty, File Explorer's 32-bit to 64-bit handshake causing UI flicker, and outdated background services like Sysmain/SuperFetch that were designed for spinning hard drives but still run on NVMe SSDs. Some fixes exist — forcing the legacy context menu via registry, disabling VBS, and turning off Sysmain in services.msc — but many issues persist until Microsoft commits to a truly legacy-free Windows.