I just wanted to share my experience after we had this feature enabled on our production instance overnight, I just wanted to share some initial results. With no other changes the optimisation alone seems to have cut >2 seconds from FCP on PageSpeed Insights - which is a great starting point
Note - we're just beginning our optimisation journey, so the scores are horrendous anyway!
Report from Wednesday:
Today:
I'll be following this thread with interest to see what more can be done with this optimisation, but it's an appreciated improvement already. 
