Fifteen percent.
The performance gap between m2 and m1max is 15%. m2 is better.
The m2 chip is equivalent to the Intel medium level. The performance of Apple's M1 chip exceeds that of the i9-9880H and is on par with that of Intel's Core 10 generation 10700 processor. In Geekbench 5, the M1 scored 19,244 points, which is comparable to the GTX 1050 display (18,500 points). After the translation, the M1's GPU performance is not able to play large games, at most can barely play a few small games.