Is there a more efficient file type for large file imports?

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I'm constantly working with enormous motorcycle platform files and spending a lot of time waiting. The native files are usually from Solidworks. I'm wondering if there's a benefit to exporting the model as a different file type. For instance, would exporting as a .STL cut down on all the wait time of file importing, laggy response in KS, long render times etc.

[KristofDeHulsters]

I find that loading in STP files go the fastest. Keyshot has to go through a lot of information that it doesn't use when going through SolidWorks models (such as materials, masses, ...)

[RRIS]

Parasolids  (*.x_t) are a bit more reliable in my experience than STEP.
Also nice is to use the Solidworks plugin, and using that to export to a Keyshot .bip file from Solidworks. Then simply open that from Keyshot.. it feels faster to me, but that could be subjective.

[TGS808]

I think STL is mostly used for 3D printing. The ones I've seen imported into KS are always very tessellated and don't look good. Like Kristof, I tend to use STP and sometimes IGES (in the rare event that an STP gives me trouble).