you can even run the mouse in loops or circles than sit back and watch the window follow its trail. open an app window and try to drag it around. To see the bug, just run a live installer like fedora, debian, or red hat. Windows and linux hosts are not affected. all other desktops or window managers ive tried also show this bug, lxde, xfce, fvwm, and kde gnome-desktop, in ubuntu, debian, or red-hat, still has the bug. The only exception is ubuntu desktop, and only when guest extensions are installed. Maximized apps (full screen) are not affected by this bug and will resize with the virtualbox window in both directions as fast as can be expected. horizontal is sometimes almost at normal speed. drag and resize both seem a little faster horizontally and vertically.
then it takes several seconds for the windows to move or resize following the drag event. When using os x (10.12.2) as the host and linux guests, gui performance is ok, except for dragging or resizing windows within the gui. Developer update: this problem needs user investigation.
