Parent is meditating over the questionable choice of words in combination. The board could be half as fast or twice as slow when compared to the M1 Mini, but if it is half as _slow_, how fast is it actually?
Half as fast would make much more sense. I've seen things like "I'm 40 years young" or a laptop is 10mm thin instead of thick. Half as fast takes it so far though and doesn't make sense.
Wouldn't half as slow be twice as fast?