Why do you think that Java, JS and other high performance managed languages all use tracing GCs? They hover around 2x native performance with that. Out of major

Why do you think that Java, JS and other high performance managed languages all use tracing GCs? They hover around 2x native performance with that. Out of major languages that try to be somewhat highish performance, only swift does ref counting, but that was more of a tradeoff for its lower memory usage which is important on mobile devices.