It didn't need those amounts of resources when Dropbox first started... What changed? Now it's literally causing Windows Explorer to be stuck on folder renames

It didn't need those amounts of resources when Dropbox first started... What changed? Now it's literally causing Windows Explorer to be stuck on folder renames etc, I'm dying to get off the bandwagon the first opportunity I get. This isn't a good way to compete in a crowded market - hope the competition is just as bad.