I always knew malloc/free is much slower than a good GC.<p>In my testcase I need 4min on freeing libredwg datastructures with ordinary sized samples. free is insanely slow, malloc is just normally slow. A GC bump allocator is 0 cost, just like a stack alloca. But it is safe, unlike alloca (search the rust issues for stack overflow => 700 issues) or malloc/free with manual management.