However, when a tracing GC runs, it has to touch massive amounts of cold data and pushes hot data out of cache. Traditional malloc/free touches data in small ch

However, when a tracing GC runs, it has to touch massive amounts of cold data and pushes hot data out of cache. Traditional malloc/free touches data in small chunks and freeing happens close to the last use, so when most of the data is still hot in cache. Stable, predictable performance is often more important than the peak performance.