I would be hugely in favor of a slimmed down minimalist version of the mod, something that would avoid MAFs at all costs.
What is the biggest fat that could be trimmed? Graphics? I can live with crappy graphics if it means the game doesn't crash. I'm on the lowest settings already anyway.
Have you tried Rise of Mankind - A New Dawn? C2C is based off of ROM AND. There is basically no-one working on it at the moment though, any little bugs or whatever you'd have to live with

It is good though for sure. Its like a refined and slimmed version of c2c without all the bells and whistles. I don't think its balanced all that well, especially things such as early game costs $$, which are way overboard imo, and late game inflation is fuct. Although I think this got fixed recently.
In terms of making c2c faster, do you run 64bit windows with 8gb of ram? If not - get this!
Not sure if its necessary, but a program called CFF Explorer, install that, then you can right click on the beyond the sword.exe > open with CFF Explorer, click on file header on the left, then click where it says "click here", this will open a menu with little boxes>> make sure App can handle >2GB address has a little tick

As I said, im not sure if this is even necessary- the mod may do this for you idk.
Also in mydocument>mygames>beyond the sword>CivilizationIV.ini open this up and you might want to turn off ALT-Tab and lower some graphics settings in there. Probably won't help all that much though..
Oh and there is a program called Prio. This allows you to save a programs priority in the task manager. Like when you control-alt-delete > start task manager > processes > right click civ4beyondthesword and set priority and have it saved for good.
Another good program is GameBooster, I just got the cracked version off piratebay, but I think you can use the free version not sure, anyway, this program clears your ram cache, closes all unnecessary programs/utilities when you launch a game. Its pretty cool, only thing is its not good for MP Games like starcraft 2 and stuff, mainly only SP games.