Strange: I'm the first to post here, although I have started the game only last weekend...!
In the middle ages I finally fell far behind in tech. I had to use all my money to build up a couple of cities and therefore went with a single scientist and a 40-turn research for quite a long time (80 turns = two techs). However, I wanted to build up one city right next to the Japanese/Arabic border very quickly, so it can build a fast Forbidden Palace. And that plan worked out well: The city was located in the middle of those nutritious floodlands and grew very fast. It also got the necessary Aquaeduct, Marketplace and Courthouse very fast, so it was having a decent production by the time I started the Forbidden Palace and I was able to finish it in around 20 rounds.
Shortly before that the Japanese went suicidal (a Kamikaze ruling them?!) and declared war on Egypt. I was able to get some money and a map from Egypt for rushing to their aid. And we made mincemeat of them, the Egyptians taking 3 Japanese cities and I taking 6. When the Japanese were down to one city, they were willing to give me 4 techs for a peace treaty! I've never seen something like this before! Usually the AI refuses to give any tech for peace and rather dies...
So this war allowed me to catch up a bit on technology and it also fitted in perfectly with my plan of building the FP at that particular part of my empire: it is now surrounded by 3 Japanese cities (and two of my own), which will make good production, once they are up to speed.
I'm now level with the Osmans and Germans, however Egypt is far far ahead of everyone else. (I would like to ask other players as well, especially the strong ones: is this normal on Emperor level, that you never have a chance against the AI in terms of tech, culture and production? Unless I manage to wear down all the others in wars later on, I never have a chance to get a culture or spaceship victory!)
Anyway, the Egyptians also took three or four cities off the Germans and are now the undisputed leader. Even though by now I have Universities and Banks in my productive cities, turned to Democracy and are able to maintain a 4-turn tech output, I don't see, how I would ever survive against the Egypts. Fortunately I had an alliance with them and "helped" them in their war against the Germans (though unfortunately I was not able to bring my forces close to the Germans and get a piece of the pie...), so they are still friendly with me.
My plan now has to be to get up-to-date weapons, then take out the Arabs and Germans, then I'll be strong enough to take the Osmans as well, and this will perhaps get me on even terms with Egypt... If they keep peaceful for long enough!
Fortunately I got three Armies already in my war with Japan. Perhaps I will fill one with Cossacks and win a fight, so I can start building them with the War Academy, and keep the others untill I got tanks... It's just: I haven't even researched Cossacks, and already they are no longer of much use: the Osmans and Egypts already have Infantry... :-( I hope I will be able to still use them against Arabs or Germans, so I can at least get my Golden Age, otherwise I'm busted.