Have a look at these pictures:

Sharp Text
Sharp Text Without DropShadowEffect

Blurry Text
Blurry Text With DropShadowEffect

In the second picture I have applied a DropShadowEffect on the Border element and as you can see, everything got blurry, despite me having set SnapToDevicePixels

I don't really understand why it has to be this way:

  1. The effect doesn't really change the Border contents.
  2. If SnapToDevicePixels is set to true and it isn't possible to conform to this why using the GPU, I think GPU acceleration should be switched off

The only information I could find about this issue was this (useless) thread.

Please tell me if you have any Ideas for solving this problem.