Hidpi setting

Hi,

I have a 4K monitor and Intellij 14.0.3 looks blurry as hell (windows 8.1 java 8)

INtellij says it supports HiDPI by adding the following flag in vmoptions

-Dis.hidpi=true

I see no difference in the results

I can get good results by disabling display scaling on high DPI setting in the Launch icon properties and scaling the fonts but menu items remain really small.

Can anyone tell me what the -Dis.hidpi=true  flag actually does ?

Thanks

Stephane