From Cold war age, add Library research to reduce upgrade time.

[Gears]

For Cold war age, remove the 'Economic Stimulus' research and switch it with research that reduces Upgrade times for Buildings, Troops, Coalitions and Tactics by either 10% or 15%.

IMO, the Library research 'Economic Stimulus' is waste of Oil resource you loot/collect.

'Like' if you agree with my suggestion,

 

[Uhuru]

Dreaming! ))