Ghost seems to work very well. I've never used it on a super high traffic site, but there's no reason to think it would fall over. It's definitely not as CPU or

Ghost seems to work very well. I've never used it on a super high traffic site, but there's no reason to think it would fall over. It's definitely not as CPU or memory efficient as WordPress can be, but that just means you'll need a bigger server for the equivalent site.