[Gmsh] Gmsh is slow after importing igs

[李宗耀]

Dear Gmsh support team,
    I have a complex geometry built in NX and I save it as .igs file. Gmsh is slow after importing the igs file. I have tried to set  Geometry.AutoCoherence option to 0 at the end of .geo file. But it doesn't work. Is there any tips? I wonder if I could convert .igs to .geo directly(I don't mean using "Merge", just convert .igs file to gmsh geometry file). 
    Thank you very much. I am looking forward for your reply.
    Good wishes!
    Zongyao Li From China
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