I suspect that’s a result of the performance. While both threads are capable of the same tasks, you don’t get the 2x performance you would with a “real” second

I suspect that’s a result of the performance. While both threads are capable of the same tasks, you don’t get the 2x performance you would with a “real” second thread, really a second core. So conceptually it’s a little more like having 1.25 single threaded cores, or whatever the ratio is for your application, if you only care about performance in the end.