I've searched and found nothing so it's possible this is only affecting me or I'm being dumb and missing something.
So the issue is pretty much in the title, I create a material, apply it to a mesh, turn on tessellation and... nothing. Both 'flat' and 'pn triangles' have no affect.
I have used this feature before and it's not particularly complicated to use so I don't think I'm missing anything but it seem strange that if this is an issue that nobody else seems to be having it.
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I did not realize that speedy would affect material settings, I thought it was limited to render settings, hence overlooking it.