@Talin,
I got your save to load. After clicking the EoT red button the running man ran for 17+ minutes before CTD.
Some observations and stats before clicking EoT:
28AI plus Russia in game for total of 29 players.
Known cities: 424 with Incan at 41 (Russia 35)
Russia's Mil str is 0.7 compared to Incans and to 2 other AI only 0.5 Therefore at least 3 AI with armies near or at twice your's in size.
I didn't go into your Mil advisor to see how many Mil Units you have. But it's easily over 100+ just from the main screen view at load. If total Mil units in game average 100 for each empire that is over 2,900 Mil units. This does not take into account workers, etc. type units.
Since your game is in the industrial Era @ 1004AD on Eternity gamespeed (995/14305 turns completed), the number of bldgs in each city is also extremely large.
Now factor in that every unit and every bldg and wonder must go thru several individual calculations to process it's turn plus all other calculation to calculate research, culture, espionage, commerce, gold/turn generated or used. Now start multiplying these processes by what is in the game so far. Even though your i7 4771 is multicored, you must remember Civ BtS engine is only single core processing.
To put it bluntly, you've smothered the Civ IV BtS engine in it's own calculations. And with the sheer volume of processes being calculated it only takes 1 graphically misdefined value to kill the graphic process. You've reached the end of this particular game on this GEM map with 32 preset Civs. IMHO you are Done. The concrete has set around your boots and you cannot move anymore. It's Finis, Kaput, Over my friend! You pushed it to the breaking point. Well Done!
JosEPh