I'm planning on upgrading a couple of sites to v1.9 later this week.
I don't suppose anyone has any has tested out what the general increase in page speed is, obviously this will depend on your server etc. But just as an idea for people?
If not I'll run some tests between 1.8 and 1.9 on my dev server, always good to be able to tell people what they might be able to expect in performance increase :)
Thanks
Jacques.