GPU fingerprinting is facilitated through websites relying on the WebGL 2.0 rendering API. This technique is currently 67% faster than any other tracking methods, but could become even faster with newer API versions. WebGL developer Khronos is looking to mitigate this type of vulnerability with a future update, while web browser developers can deactivate the API by default.
https://www.notebookcheck.net/Researchers-demonstrate-GPU-tracking-method-that-could-impact-online-privacy.597047.0.html