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Are you using a virtual machine?

daniel said :

MESA is an emulation of OpenGL... you are not using your graphic card driver here.

Oh?!
I thought it was some open source library implementing 3D in real time for openGL or something like that.
And which is need by Linux based OS.
( not a great source but :
[fr] https://fr.wikipedia.org/wiki/Mesa_3D
[en] https://en.wikipedia.org/wiki/Mesa_(computer_graphics) )

I'm on a native desktop Ubuntu 16.04 64bits environment.
I do not use any virtual machine.

Sorry, what I meant is that you are probably not using your driver because we don't know what MESA actually uses - it's an abstraction layer - and you said that it was very slow and the CPU was used anytime you moved the 3D view.