"Creating preview mesh" is drastically slow for this file on Rhino 6

Please switch to Perspective viewport after opening the file. On my computer, Rhino 6 SR3 takes about 10 minutes to create the preview mesh while Rhino 5 only takes ~10 seconds.

The file consists a BRep with 22765 surfaces.

The file is here:

Hello - thanks, I’ll take a look - there have been other similar reports.

@gankeyu - thanks for the example , this is very slow here as well.


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