Here's the difference between Odyssey and Marathon:-
Code:
<GameSpeedInfos>
<GameSpeedInfo>
<Type>GAMESPEED_ODYSSEY</Type>
<Description>TXT_KEY_GAMESPEED_ODYSSEY</Description>
<Help>TXT_KEY_GAMESPEED_ODYSSEY_HELP</Help>
<iGrowthPercent>150</iGrowthPercent>
<iTrainPercent>150</iTrainPercent>
<iConstructPercent>150</iConstructPercent>
<iCreatePercent>150</iCreatePercent>
<iResearchPercent>500</iResearchPercent>
<iBuildPercent>150</iBuildPercent>
<iImprovementPercent>150</iImprovementPercent>
<iGreatPeoplePercent>150</iGreatPeoplePercent>
<iCulturePercent>300</iCulturePercent>
<iAnarchyPercent>200</iAnarchyPercent>
<iBarbPercent>400</iBarbPercent>
<iFeatureProductionPercent>150</iFeatureProductionPercent>
<iUnitDiscoverPercent>150</iUnitDiscoverPercent>
<iUnitHurryPercent>150</iUnitHurryPercent>
<iUnitTradePercent>150</iUnitTradePercent>
<iUnitGreatWorkPercent>150</iUnitGreatWorkPercent>
<iGoldenAgePercent>125</iGoldenAgePercent>
<iHurryPercent>66</iHurryPercent>
<iHurryConscriptAngerPercent>150</iHurryConscriptAngerPercent>
<iInflationPercent>10</iInflationPercent>
<iInflationOffset>-225</iInflationOffset>
<iVictoryDelayPercent>300</iVictoryDelayPercent>
<iPillageCommercePercent>100</iPillageCommercePercent>
<GameTurnInfos>
<GameTurnInfo>
<iMonthIncrement>180</iMonthIncrement>
<iTurnsPerIncrement>100</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>120</iMonthIncrement>
<iTurnsPerIncrement>300</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>60</iMonthIncrement>
<iTurnsPerIncrement>170</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>24</iMonthIncrement>
<iTurnsPerIncrement>201</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>12</iMonthIncrement>
<iTurnsPerIncrement>129</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>6</iMonthIncrement>
<iTurnsPerIncrement>180</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>3</iMonthIncrement>
<iTurnsPerIncrement>264</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>1</iMonthIncrement>
<iTurnsPerIncrement>156</iTurnsPerIncrement>
</GameTurnInfo>
</GameTurnInfos>
</GameSpeedInfo>
<GameSpeedInfo>
<Type>GAMESPEED_MARATHON</Type>
<Description>TXT_KEY_GAMESPEED_MARATHON</Description>
<Help>TXT_KEY_GAMESPEED_MARATHON_HELP</Help>
<iGrowthPercent>300</iGrowthPercent>
<iTrainPercent>200</iTrainPercent>
<iConstructPercent>300</iConstructPercent>
<iCreatePercent>300</iCreatePercent>
<iResearchPercent>300</iResearchPercent>
<iBuildPercent>300</iBuildPercent>
<iImprovementPercent>300</iImprovementPercent>
<iGreatPeoplePercent>300</iGreatPeoplePercent>
<iCulturePercent>300</iCulturePercent>
<iAnarchyPercent>200</iAnarchyPercent>
<iBarbPercent>400</iBarbPercent>
<iFeatureProductionPercent>300</iFeatureProductionPercent>
<iUnitDiscoverPercent>300</iUnitDiscoverPercent>
<iUnitHurryPercent>300</iUnitHurryPercent>
<iUnitTradePercent>300</iUnitTradePercent>
<iUnitGreatWorkPercent>300</iUnitGreatWorkPercent>
<iGoldenAgePercent>200</iGoldenAgePercent>
<iHurryPercent>33</iHurryPercent>
<iHurryConscriptAngerPercent>300</iHurryConscriptAngerPercent>
<iInflationPercent>15</iInflationPercent>
<iInflationOffset>-200</iInflationOffset>
<iVictoryDelayPercent>300</iVictoryDelayPercent>
<iPillageCommercePercent>100</iPillageCommercePercent>
<GameTurnInfos>
<GameTurnInfo>
<iMonthIncrement>180</iMonthIncrement>
<iTurnsPerIncrement>100</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>120</iMonthIncrement>
<iTurnsPerIncrement>300</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>60</iMonthIncrement>
<iTurnsPerIncrement>170</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>24</iMonthIncrement>
<iTurnsPerIncrement>201</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>12</iMonthIncrement>
<iTurnsPerIncrement>129</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>6</iMonthIncrement>
<iTurnsPerIncrement>180</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>3</iMonthIncrement>
<iTurnsPerIncrement>264</iTurnsPerIncrement>
</GameTurnInfo>
<GameTurnInfo>
<iMonthIncrement>1</iMonthIncrement>
<iTurnsPerIncrement>156</iTurnsPerIncrement>
</GameTurnInfo>
</GameTurnInfos>
</GameSpeedInfo>
<GameSpeedInfo>
OD had exactly the same amount of turns as Marath, but only half the build, growth, work troop construct rates. Even though it has 5/3 * the research time, all these other factors are going to eventually mean that tech is after a certain point, propelled forward faster than on marathon. Especially on larger maps, this will mean eras being reached much earlier.
If you want a "true" Odyessy speed, you need to start with more turns and longer build/train/work rates to start with. Then you need to rebalance barbarian emergence, then you need to tweak about a thousand other things, believe me I once made a "long research marathon version of the game"
Its a massive amount of work to balance properly.BUT since I've never played ODY speed, Im only estimating on my previous marathon altering experience. Small changes often tend to have a "butterfly effect" with something as logarithmic in its growth, and as complicated as CIv IV...its a minor miracle something as modded as HiTM works as well as it does, Kudos to Grave