Particles display in the viewport synchronized with a viewport shading window

The particles system in blender need some works as it's gettting slow very quickly because the particles objects are displayed in the viewport , it would be nice to have the particles displayed only as Hair and the objects displayed only in the viewport shading and synchronized , or simply change the shading mode like that you can see in real time what you're doing , no need to press render to see the result ,and you could have better performances