Civilization – Prevent tech tree overview from closing when clicking a tech

I believe you can just modify CIV5GameSpeeds.xml to suit your tastes. It will be in the Assets\Gameplay\XML\GameInfo folder of your Civ 5 folder.

Each difficulty level is listed, with a bunch of percentages that are applied to the cost of everything. The ones you are likely interested in are TrainPercent (presumably affecting the cost of units) and ConstructPercent (presumably affecting the cost of buildings). I'm not sure about CreatePercent, I think that may affect the cost of Wonders, but I'm not certain. And there is also BuildPercent, not sure what that is. So just take a text editor, adjust the values for the difficulty level you want to play, and then start a new game.

I guess the other option would be to start with the normal game length and just increase the relatively obvious settings for Research and Culture percent (if that really is all you want to slow down). I have a feeling this won't necessarily give the feeling you want though, you'll just end up with a game that feels like it is moving fast but you can't research anything.

If you have up to date video drivers, then the most likely cause is a bad civ 5 install or bad Steam data on Civ5. I've had this sort of issue with Steam before, just not on Civ5 specifically.

• First order: make sure you have latest drivers.
• Second order: Verify integrity of Civ 5 installation via "Verify Integriy of Game Cache".
• Third order: delete Civ 5 off the box, reinstall from Steam.
• Fourth order: copy SteamApps data to temp space, delete steam, reinstall steam, copy SteamApps data back.

That's all the steps I've had to take in the past to get a broken steam game working. If none of this works for you, sorry, but this list has been all I've ever had to perform. Although I have had to do the first and second options repeatedly to fix a game.