Collada is an XML-based format -- it is just brutally bad. You need to use a binary format for fast loading times. Thus binary glTF or binary Three.JS or something custom.
Just pounding this in even further because I see it so much: Collada, OBJ, STL and similar formats are expressly designed to be editor formats and expressly not intended as consumer distribution formats. Any time they are used they give the app and WebGL in general a reputation for being bloated and slow.
You wouldn't use PSDs in your webpage. You'd use PNG/JPG. Pleas don't use Collada in your web page. Please use glTF.
