Could be evolution script little optimised;
-remove missions
-only one city available for attacking, others can not be triggered
-destroyed(enemy) objects should disappear after a some period of time
or at least in conquered cities, this might be a good reducement of calculation
-fight only on south sahrani
Of course all should be server-side options, because there are many players who would still want to have missions or other stuff, but there is also many players who rather sacrifise candy things to get smoother game.