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First, the speed notification is more than half way down the page and is hardly a huge selling point, second, they clearly footnote it with a link, and third the footnote lays out specifically what they are comparing with and to. It is literally right on the page.
If only Apple clarified the 1.4x thing with a footnote of some kind.
Oh wait, they do:
Testing conducted by Apple in May 2022 using preproduction MacBook Air systems with Apple M2, 8-core CPU, 10-core GPU and 24GB of RAM, as well as production MacBook Air systems with Apple M1, 8-core CPU, 8-core GPU and 16GB of RAM, all configured with 2TB SSD, as well as production 1.6GHz dual-core Intel Core i5-based MacBook Air systems with Intel UHD Graphics 617, 16GB of RAM and 1TB SSD. Final Cut Pro 10.6.2 tested using a complex 2-minute project with 4K ProRes 422 media. Performance tests are conducted using specific computer systems and reflect the approximate performance of MacBook Air