This is a list from legend,one of the devs, that givse some changes you can make to your settings normally.
There was another post about things that affect the game and it's speed... the simplist things are (as mentioned) savegames... reduce how often this happens or turn it off... and filters. LOS filter, close combat filter, ownership filter, etc. they all add to the speed of the game.
Also one i know can have a measureable effect is the movement paths, turning these off can help alot.
And heres a post qoute from red ,talking about the ini change
In INI\Options.ini, your last line is:
speedrateslices 0, 15, 40, 100,
This is pause, slow, normal, fast. I think there are 1400 slices to a day. Having modified settings there could cause multiplayer problems, but within the game, it doesn't bother anything. Still, you may not see a noticeable difference from raising the fast value if your system is limited
Now again,if your game is running slow becuase its alreayd pushing your system to its max,these ini changes may have zero effect.
And remember, always make a copy of anythig you change and save it somewhere, so its easier to change back.