DAE 3D models are often large because the Collada format stores uncompressed, detailed data (textures, animations, scene metadata) to support cross-tool compatibility.
DAE values flexibility over size, so it keeps full raw info—high-resolution textures, complex rigs, multiple material layers—which boosts file size.
To reduce size, compress embedded textures (e.g., PNG to JPG) or use 3D software to delete unused elements (hidden objects, redundant keyframes) before exporting.