Apple's a15 and a14 are both based on TSMC's 5-nanometer process, but the a15 uses TSMC's latest n5p technology to integrate more transistors, with about 11.8 billion transistors integrated in the a14 and 15 billion in the a15. A 20% improvement in performance.
The performance of the A15 is at least 30% higher than that of the A14, and the 5nm baseband will also have lower power consumption, and the problem of high standby power consumption can be solved.