To reduce high poly 3D models fast, use automated decimation tools (e.g., Blender’s Decimate Modifier, ZBrush’s Decimation Master) and prioritize preserving key details (like edges or texture alignment).
Decimation algorithms lower polygon count quickly—balance the reduction ratio (30–70%) with keeping features critical to the model’s purpose (e.g., a character’s face or a prop’s mechanical parts).
This method works for game development (real-time performance), AR/VR (smooth rendering), or web/animation (faster loading).
For beginners, try Blender’s free Decimate Modifier: add it to your model, slide the "Ratio" while previewing, check "Preserve UVs" to keep textures—stop when details stay clear but poly count drops enough.