Apple and all other big hardware manufacturers have huge Research and Development teams (more commonly called R&D) to try and cram every last drop of performance out of every new piece of hardware they work on. At this stage in the technology game we’re literally pushing the physics to it’s (known theoretical) limit to make smaller and smaller components.
Chances are they had the concept of whatever made the newest phone X% faster in the works for years but couldn’t source materials or funding to bring it to fruition, and instead worked towards it over time, and in the future they’ll increment performance a little bit more.
What exactly Apple doing we do not know. Because they now produce their CPUs in house they could be adding almost anything to them and wouldn’t need to tell the general public anything about it. Although I’d wager the 40% figure you quoted comes from a very specific task that a previous iPhone just wasn’t necessarily designed to do (4K+ video editing perhaps?)
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