Archive.org has a few months delay at minimum.

Not bad for an "advertising company".

Google cache is a great service, like I said, I am not anti-google.

I use own blogging software on a low-end Intel Atom which keeps consistently generating pages around 20ms under load. So imho Wordpress is the fault here, not the caching plugin. Of course Wordpress is great software to use as writer and has a lot of features that are very easy to use, so I understand why you'd use it. I just think it's cool when I'm running something on 10x slower hardware than everyone else without compromising on performance.