Older hardware hasn't quite been solved by windows yet AFAIK. Being the "computer guy" in my family, I'm frequently handed old W7, Vista, and XP laptops that are "running slow". Since a lot of my family isn't too well off, "buy a new laptop that isn't a 1.7Ghz processor with 2 GB RAM" isn't a viable answer. I can't leave them with W7 anymore because of the near future of missing security updates, so lately I've just been wiping them (after backing up everything important of course) and throwing ElementaryOS on there. Runs like a charm, unlike fresh W10 installs on these machines which I can only classify as "almost unusable".