Unless you can come up with a specific reference, it seems unlikely that this would explain the large memory efficiency difference. By contrast it is simple and straightforward to understand why keeping temporary garbage until garbage collection could result in tying up a lot of memory while continually running code that allocates memory and lets it go out of scope. If you search, you'll find lots of references to this happening in a variety of languages.
Unless you can come up with a specific reference, it seems unlikely that this would explain the large memory efficiency difference. By contrast it is simple and straightforward to understand why keeping temporary garbage until garbage collection could result in tying up a lot of memory while continually running code that allocates memory and lets it go out of scope. If you search, you'll find lots of references to this happening in a variety of languages.