Software:
Blender 2.79
In large scenes, selecting objects becomes slow.
There’s a frustrating lag and the software hangs between the time you Right-Click an object in the view-port, and the time it gets selected.
* especially if there are a lot of mesh surfaces behind it in the view-line of the mouse cursor.
The Systems settings shown below can dramatically improve this.
* You need a GLSL capable video card.