"lean" is not limited to memory though - walking down the vdom reconciliation tree can incur get some pretty large overheads in terms of nested JS calls, just t

"lean" is not limited to memory though - walking down the vdom reconciliation tree can incur get some pretty large overheads in terms of nested JS calls, just to decide that only a few buttons have to change. PureComponents and things like that are meant to help with this, but it still can take quite a bit of engineering effort to get this right. Mind you, I don't actually know if Svelte avoids this problem, but a statement like "doesn't depend on virtual DOM reconciliation or anything like that" kind of implies that it defaults to less work.