ID 416584 - Viewport selection performance is slower in 13.2

Problem summary
The Viewport selection performance is slower in 13.2 when using a dual-processor machine.

Customer reported version
modo.13.2v1

Customer reported platform
windows10

Steps to reproduce

1) Download and open the attached scene file.
2) Set the 3D viewport to Top perspective and Wireframe mode. (Operation is also slow in all other types of views and drawing modes)
3) Select some of the items in the viewport.

Expected behaviour
The item should instantly be selected.

Actual behaviour

The viewport lags and the selection of the item is delayed.

Workaround
Unknown.

Reproduced by support

This bug has been reproduced in:
13.2v1 - Windows 10, OSX 10.13, Centos 7

13.1v1 - Windows 10, OSX 10.13, Centos 7

Unable to reproduce bug in:
13.0v1 - Windows 10, OSX 10.13, Centos 7 

Earliest version tested

13.0v1 - This issue doesn't appear in this version and has regressed.