Alt-tabing from one client fullscreen window to another does take exactly 4 seconds now. It was just one second before. That does limit boxing on a single computer as Alt-tabing in windowed mode is not easily possible at Windows 10. Same for Alt-Return when switching from windowed to fullscreen mode and vice versa. Same for activating an EQ client fullscreen window from the Windows desktop. Same for /camp desktop in fullscreen mode. 4 seconds lag before the client does get closed.