We use automatic feedback directed optimization[1], which lowers the cost quite significantly in practice [1] https://research.google.com/pubs/pub45290.html ht

We use automatic feedback directed optimization[1], which lowers the cost quite significantly in practice [1] https://research.google.com/pubs/pub45290.html https://research.google.com/pubs/pub45290.html Performance gains are even higher now than they were then.