Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen)
Short description of error
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
when i switch to full screen the blender freezes the screen for about 15 sec and after that only i can use blender, same when switching to window mode.