Disable portions of the map (maybe be de jure kingdom/empire?) Personally, playing in western Europe, I would disable, India, Tartaria, Persia, Ethiopia, Mali... maybe Russia. I just don't want or care about these regions slowing my game down so much.
Turn the game difficulty up to very hard, maybe some added rules about laws, start as a Welsh count, drive out the invaders and work on maintaining power through the centuries, with fairly limited outside interaction.
Or, start in India, disable all of Africa, Europe, the steppe and just leave a bit of Afghanistan/Persia to terrorize India. Then enjoy playing India, ignoring those other troublesome parts of the map.