To speed up importing high-poly 3D models, optimize the model’s geometry and adjust software import settings.
Reduce non-essential polygons with decimation or LOD (Level of Detail), delete unused materials/UVs, and use lighter file formats like OBJ. For software, temporarily disable auto-smooth, texture previews, or normals import.
In Unity or Blender, turn off "Generate Lightmap UVs" or "Import Animations" (if unnecessary) to cut import time fast.