Unlike in C you can't tell the garbage collector to "ignore" a large chunk of the memory allocated in the buffer. what ends up happening is Go's GC spends lots

Unlike in C you can't tell the garbage collector to "ignore" a large chunk of the memory allocated in the buffer. what ends up happening is Go's GC spends lots of time traversing the heap and marking anyway and end up doing nothing. I know they've made optimizations like here https://github.com/golang/go/issues/9477 https://github.com/golang/go/issues/9477 but I haven't followed it up and gave it another look yet.