I agree with this comment. Interestingly they're trying to implement it on Go Daddys systems for 8.5 million customers. This suggests they must be fairly confid

I agree with this comment. Interestingly they're trying to implement it on Go Daddys systems for 8.5 million customers. This suggests they must be fairly confident that the optimisations are safe for the vast majority of sites. I wonder which filters Go Daddy will enable and how many problems it will cause.