According to another comment[1], to achieve 50% savings, encoding time needs to be 10x to 20x longer. I suspect that in the race to be the first group to release, they use faster settings at the expense of artifacting.<p>[1] <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10888898" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10888898</a>