No. The low memory laptop (HP DV9000, 1 GB RAM, AMD Turion) was a clean install (using the entire dsk). So thats not it. Like I said, as I watched the memory usage, I saw it peak at about 970 MB during the install. Mind you, the thing is at least 11 years old., runs hot, fans blazing...I'm happy it installed at all - awaiitng 3.7.2 to report on that.
On my Dell XPS 13 (8 GB RAM, i7) it was a migration.Typing this on 3.7.1 now, using Firefox...