In tables found on this Wiki, the values of Speed Up! are assumed to be at the start of the building, upgrade, or deals. This means that these values will diminished as the timer (time cost) goes down.
The in-game computation for the Speed Up! cost (Gems) is:
SpeedUpTimeCost = time_remaining / cost_interval SpeedUpCost = CEIL(SpeedUpTimeCost * SpeedUpCost * SpeedUpFactor)
CEIL()is ceiling function
time_remainingis the time remaining before the action is completed (in minutes)
cost_intervalis 10 for contracts, and 30 for constructions and upgrades
SpeedUpFactorare in-game values
SpeedUpCostis the Speed Up! base value
SpeedUpFactoris a Speed Up! multiplier
There is also
SpeedUpMinCost value that restricts the minimum value of the Speed Up! cost. That is, if the
SpeedUpMinCost is 2 and the computed
SpeedUpCost is 1, the Speed Up! cost is still 2.
By default, the values of
SpeedUpMinCost are all 1.