To fix huge OBJ 3D model sizes, simplify geometry (reduce unnecessary polygons) or optimize linked textures (compress/downscale).
Key steps to reduce size: - **Cut polygons**: Use Blender’s Decimate modifier to remove excess while keeping key details. - **Compress textures**: Use tools like TinyPNG to shrink high-res images if fine details don’t matter.
OBJ files bloat from too many polygons or large textures—they store shape data and reference external images. For web/AR, start with mild polygon reduction (20-30%)—it often slashes size without visible quality loss.