When can garbage collection be faster than manual memory management?
Under what circumstances is garbage collection more efficient than manual memory management?  (Here manual could mean using malloc and free as in C, or the cleaner RAII and smart pointer techniques popularized by C++)

I like how garbage collection can remove some accidental complexity from writing software, but I was even more pleased at how RAII and smart pointers can eliminate that complexity while also working on resources other than memory, being deterministic, and providing performance guarantees and being more efficient overall.  So I thought I could safely ignore garbage collection.  However, I've noticed that people have been saying that garbage collection is faster than the tight resource management used in C++, such as when there is a lot of extra memory available.

So when exactly can garbage collection outperform manual memory management?  I like RAII and smart pointers but would happy to accept garbage collection as another tool if it is faster.
When can garbage collection be faster than manual memory management?
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Under what circumstances is garbage collection more efficient than manual memory management?  (Here manual could mean using malloc and free as in C, or the cleaner RAII and smart pointer techniques popularized by C++)

I like how garbage collection can remove some accidental complexity from writing software, but I was even more pleased at how RAII and smart pointers can eliminate that complexity while also working on resources other than memory, being deterministic, and providing performance guarantees and being more efficient overall.  So I thought I could safely ignore garbage collection.  However, I've noticed that people have been saying that garbage collection is faster than the tight resource management used in C++, such as when there is a lot of extra memory available.

So when exactly can garbage collection outperform manual memory management?  I like RAII and smart pointers but would happy to accept garbage collection as another tool if it is faster.