It seems to be structured more like Metal, DirectX 12 or Vulkan, so it's probably lower-level than WebGL, and reduces CPU load by lowering the cost of draw call

It seems to be structured more like Metal, DirectX 12 or Vulkan, so it's probably lower-level than WebGL, and reduces CPU load by lowering the cost of draw calls. These lower level APIs also make better use of multi core CPUs, and look at the huge performance differential between the other Macs and the likely high-core-count iMac Pro. Their performance chart only lists Mac computers, so I assume under the hood this specific implementation is either translating WebGPU calls to Metal calls or at least the implementation is more like Metal. I suppose on other platforms, replace Metal with Vulkan or DirectX 12. I just like reading about this stuff, I am not a graphics programmer, so I may be wildly off base.