Laggy geometry window

[tkbd]

I researched at some of the camera lags in the Geomtry window too.
Not only polygons in one object but also a lot of objects in a scene will cause lag.

I did test by 2 wings files.

A Wings file that contains 448 Cubes= 448 objects (2688faces)
v1.5.4 : very fast.
v2.0 - 2.1.5 : very Slow.

A Wings file that contains 1792 Cubes (10752faces)
v1.5.4 : A little slow.
v2.0 : very slow but Geometry graph OK
v2.1.5 : To doing Everything will be lagged very much. Freeze if open Gemtery Graph window.

But on v2.x.x, Using to Body > Combine command, and many cubes makes to grouped, the camera moved very quickly!!!
Perhaps Geometry Graph process and WxWidgets are a bottleneck.

(MacOSX 10.11.6, 2.8GHz Interl Core i5 (2 Core) ,Memory:8GB, Intel iris 1536MB)

In such a case,How to speed up an operation?, working by wireframe mode or Use Body > combine command to the objects.
I think developers are doing their best.
So, I report this and would like to expect at the next version.
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tkbd