> Isn't it a 15% increase?

At least according to Geekbench, it's a 20% performance increase.

> The M3 chip has single-core and multi-core scores of about 3,000 and 11,700, respectively, in the Geekbench 6 database. When you compare these scores to those of the M2's single-core and multi-core scores (around 2,600 and 9,700, respectively), the M3 chip is indeed up to 20% faster like Apple claims.

https://www.laptopmag.com/laptops/macbooks/apple-m3-benchmar...

Along side a battery life increase to 22 hours? It's been a pretty good showing.