I'm having a problem with tech research recently, I have the latest build installed. I like to Rush Philosophy and then Optics. It took almost 40 turns to research Philosophy when it should have taken maybe 12. Optics was absurd, the game said it would take 70 turns. I am playing on Standard Speed, Emperor Difficulty. My science really isn't that low at all, are tech costs being changed to slow down the game? Looking at the tech tree, the turns to research get to be pretty insane a couple of columns down the tech tree.