Many of them do have stop-the-world GC. A well implemented stop the world GC allows higher throughput, at the cost of increased latency. This is especially the

Many of them do have stop-the-world GC. A well implemented stop the world GC allows higher throughput, at the cost of increased latency. This is especially the case when provably-local allocations can be put onto a thread-local heap, and you only do stop-the-thread GC on those. So, in the absolute sense, stop-the-world GC overhead is lower than incremental, low-latency GC. But yes, we have GC that is fairly responsive these days, too, for when throughput isn't the driving concern.