To improve our performance, we have to be more energy efficient. This requires us to reduce overhead required to run programs. Hence, the ASIC systems perform much better than generic processors like CPUs

It is certainly understandable that specialized hardware has more energy efficiency. But this slide seems to imply that specialization does not have any impact on the performance. Is this true in the most general sense?

What does a high energy efficiency imply in terms of performance / arithmetic intensity? I think my question is pretty similar to @pranil's.