Microsoft has confirmed that it's still working to fully address a known issue that causes bright white flashes when opening the File Explorer on some Windows 11 systems.
Microsoft’s Windows 11 Insider Preview Build 26220.7961 for 25H2 fixes File Explorer flashes, adds voice typing for renaming, and restores Administrator Protection.
Windows 11 recently received a fix for File Explorer sluggishness The cure is in preview, and tackles the overly slow opening of folders by using preloading Based on initial testing it seems to work ...