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Broadwell is the 14nm shrink of Haswell. The inexpensive Broadwell parts haven't had steller performance, but that's because they're TDP limited to 4.5W, or Atom territory.

You're probably thinking of the M series Broadwell chips. The Core i series isn't really out yet, but I think it should be comparable (and more efficient) than the Haswell i7 chips...

I think you are talking about Bay Trail, which powers the low end Chromebooks and is a replacement for the Haswell Celeron, not Broadwell in general. The new Bay Trail chips are indeed horribly slow compared to last gen Haswell Celerons (i.e. the one in Acer C720).

Ahh, that's probably it. Thanks!