Windows 11 requirements can be checked using the PC Health Check app that Microsoft released. However, it seems the app is misidentifying a hyper-threaded Pentium 4 as a CPU officially supported.
Microsoft's David Weston has explained why some of the security-related features in Windows 11, like Virtualization-based Security, TPM 2.0, and more, are so crucial for the OS for now and beyond.
According to a report from 3DMark creator UL Benchmarks, Microsoft's VBS feature can incur a noticeable performance hit on Windows 11 PCs. Testing shows varying results between Beta and Dev builds.