For beginners optimizing a Unity Assets 3D model, focus on two simple, high-impact steps: reduce polygon count (mesh simplification) and compress textures—they boost performance without advanced skills.
Fewer polygons ease GPU strain: Use Unity’s Mesh Simplifier component or Blender’s free Decimate modifier (before importing) to cut excess. Aim under 10k for mobile/20k for PC—check Unity’s "Stats" window if lagging.
Texture compression saves memory: In Unity’s Texture Import Settings, set format to "Compressed"—one click, minimal quality loss.
These basics fix most beginner issues fast—start here before trying complex tweaks.