Three.JS Atlas Loader

threejsatlasloader.js

// json is a JSON atlas generated by TexturePacker
// imagepath is a url to the full texture atlas image

var atlasTexture = THREE.ImageUtils.loadTexture( imagepath, undefined, function() {

	for (var key in json.frames) {
		var tex = atlasTexture.clone();
		var frame = json.frames[key].frame;

		tex.repeat.x = ( frame.w / atlasTexture.image.width );	
		tex.repeat.y = ( frame.h / atlasTexture.image.height );
		tex.offset.x = ( Math.abs( frame.x ) / atlasTexture.image.width );
		tex.offset.y = ( Math.abs( frame.y )/ atlasTexture.image.height );
		tex.needsUpdate = true;

		var material = new THREE.MeshPhongMaterial( { transparent:true, map: tex, side: THREE.DoubleSide} ); 
		scope.materials.push( material );
	}
});

Are you make clone of whole image for every frame ? O_o
or it is just copy of texture that used the same image all time?

https://threejs.org/docs/#api/textures/Texture
Texture.clone is not a "deep copy", the image is shared.