For anyone coming back reading this.
Above options regarding workers for gltfLoader should not be needed for gltfLoader anymore since gltfLoader uses ImageBitmapLoader on most major browsers (except safari and old versions of firefox) and it will automatically decode the textures via workers.
// Use an ImageBitmapLoader if imageBitmaps are supported. Moves much of the
// expensive work of uploading a texture to the GPU off the main thread.
const isSafari = /^((?!chrome|android).)*safari/i.test( navigator.userAgent ) === true;
const isFirefox = navigator.userAgent.indexOf( 'Firefox' ) > - 1;
const firefoxVersion = isFirefox ? navigator.userAgent.match( /Firefox\/([0-9]+)\./ )[ 1 ] : - 1;
if ( typeof createImageBitmap === 'undefined' || isSafari || ( isFirefox && firefoxVersion < 98 ) ) {
this.textureLoader = new TextureLoader( this.options.manager );
} else {
this.textureLoader = new ImageBitmapLoader( this.options.manager );
}