Impacts of garbage collection

Depends on algorithm, the performance of garbage collection can depend on the number of objects or the size of the heap. GC needs time to detect reachable and unreachable objects. During this step, automatic memory management might lose out to manual memory management because a developer may have already known which objects should be destroyed. And after this stop the world—also known as the GC pause—is invoked, the GC suspends execution of all threads to ensure the integrity of reference trees.