Draco compression is the difference between a 90MB glTF export and a 3MB one. For CAD-heavy product models it is not optional. But there is a trap in the standard setup that quietly costs you half a second on first paint.

The default that looks fine

Most examples point the decoder at Google's CDN:

const dracoLoader = new DRACOLoader () dracoLoader . setDecoderPath ( ' https://www.gstatic.com/draco/v1/decoders/ ' )

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It works. It also means every first-time visitor makes a cross-origin trip to fetch the WASM decoder before a single triangle appears.…