Bearing in mind the Orwellian doublespeak of "peak performance" really means halving the CPU speeds...
"In other words, Apple decided on behalf of its customers that they'd prefer an iPhone that performed worse for the same amount of time, than an iPhone that performed just as well for a shorter amount of time. It's a decision that does nothing to dispel the characterization of Apple as a company that does what it can to push customers into buying new phones."
You can basically HALVE any benchmark comparison result for any iPhone in the future!