[Python] Avoid waiting for mesh generation

@ivelin.peychev wrote:

Use Case:
Scenario 1:
You have closed polysurfaces exported from another CAD. Export them with IGES. Assume that is the only way and STEP is not supported from that other application.

You then import the IGES in Rhino. Polysurfaces are exploaded. If you try to use Python to find separate surfaces by name in order to join them into polysurfaces again the time it takes increases exponentially with the number of the polysurfaces. Due to waiting for mesh generation.

Scenario 2:
If you use STEP the join operation is executed upon import. Surfaces are joined really fast and the mesh generation happens after they are all joined.

Questions:

1. Why does it take so much time to do this with Python and not with STEP?
2. How can I avoid mesh generation during the join?

Thanks in advance.

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