In older versions (5.6) the editor ran fine, but the last ones (2017) the editor is very lag.
When I minimize it, it takes forever to maximize it again. That is the biggest issue.
So I did the old trick from this post (put -force-opengl at the end of the shortcut) and put my assets to Manual Update (as in this post ).
And its working faster.
Yeah, Manual Update of assets seems bad, but sometimes when you change something in a script and you just want to change one thing in editor before updating the code again, its very cool.
And about using OpenGL, I think its some issue with the DirectX 11 on editor.