I've used fences for quite a number of years and always had this issue to some extent but put it down to the laptop I was using, however having just upgraded to a brand new i7 16GB lenovo X380 yoga the problem persists and it's quite annoying.
When pressing the Win-D shortcut with fences enabled the whole system freezes up for a while (around 5 seconds) with the desktop wallpaper showing and no icons or fences, the screen then goes black briefly and the desktop reloads with the taskbar icons coming back one by one and the icons and fences rendering.
When manually minimising each window this doesn't happen, not does it happen with fences disabled.
Any ideas how to prevent this annoying behaviour?