According to various sites, the Mediatek Dimensity 6100+ is a 6nm update to a core that was released 3 years ago (Dimensity 700 on a 7nm). It's 5-10% faster, likely due to the update from 7 to 6nm, as the cores are the same and run at the same speed. It contains an updated bluetooth chipset (from 5.1 to 5.2) and supports a larger max camera. The camera on the A15 is well below the max size of the previous chipset, however, the increased camera bandwidth should ensure that the camera feels snappier (a common complaint on low-end phones). The process improvement should increase efficiency as well, however, there are not benchmarks that are able to test this.