https://medium.com/p/302f83a362a3 https://medium.com/p/302f83a362a3 There's a heading "This is how we made it fast" about 1/3 of the way down if you'd like to

https://medium.com/p/302f83a362a3 https://medium.com/p/302f83a362a3 There's a heading "This is how we made it fast" about 1/3 of the way down if you'd like to skip the introduction and background.