Rendering is fastest when dont through Nvidia Iris compatible Graphics card.
CPU Rendering is used as an alternative when no compatible graphics card is available. Hyperthreading should have no effect on rendering speed.
3D rendering softwares are intensively using the graphic card and CPU features. The software has been built to use these features. If your computer doesn't have these features, you cannot use them properly or use the software at all... Thus, recommended hardware on which the software has been proved to work.
It doesn't mean you must have those hardware, but you might experience glitches.
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