I get that the player should be put on a timer during fights, but why exactly do smaller ship classes need to have lower peak performance times. When fighting most singular fleets, any ship running out of CR usually not an issue, but if you need to fight two or more large fleets, fielding anything smaller than a cruiser becomes a liability due to CR, even if you stack every combat readiness bonus you can get your hands on. This forces the player to not use destroyers and frigates in long fights. Punishing the player for building a balanced fleet just seems weird. Additionally, combat readiness is a bad mechanic for balancing ships. Nerfing the CR of an overpowered ship just results in a ship that is almost just as overpowered in fights that aren't long enough for it to be an issue and unusable in fights long enough to drain it. Overall, low CR either has very little impact or makes a ship unusable depending on the size of the fleet you're fighting. For these reasons I think it would be best to give all ships similar combat readiness related stats and to balance ships through other means.