I don't know how much things got better from performance standpoint - Oracle is pretty good on that front - but they built their own Aurora database adding all

I don't know how much things got better from performance standpoint - Oracle is pretty good on that front - but they built their own Aurora database adding all the missing features to it and then migrating to it. (Bunch of blog posts on Aurora look it up.) Knowing what I know about Oracle licensing it must have gone pretty well on the money front!