The imported file size is more than <number> MB. This would cause a large performance impact to Define Workspace and Drawing Update performance. Please try to simplify the file to reduce its size. - Intergraph Smart 3D - Troubleshooting

Intergraph Smart 3D Troubleshooting Reference

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English
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Intergraph Smart 3D
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Troubleshooting
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Troubleshooting
Smart 3D Version
11 (2016)

Meaning: The size of the imported file is large. Smart 3D cannot import this file because it will slow down some operations.

Recovery: Reduce the size of the file, and then reimport the simplified file.