IIRC, that 5x figure was assuming they could improve about 50% across four consecutive versions, as 1.5^4 ~= 5. I think the first stage improved things by 25% o

IIRC, that 5x figure was assuming they could improve about 50% across four consecutive versions, as 1.5^4 ~= 5. I think the first stage improved things by 25% on average, so I wonder if that initial 5x figure should be updated to 2.5x, as 1.25^4 ~= 2.5.