Ship's speed can take the following values:
- Slow (低速)
- Fast (高速)
- Fast+ (高速+)
- Fastest (最速)
Initially, a ship is either slow or fast, the speed can be increased (from slow to fast to fast+ to fastest) using the engine synergy, by equipping a turbine (can be equipped in the expansion slot) and one or more boilers (Enhanced Kanhon Type Boiler and New Model High Temperature High Pressure Boiler) on a ship. The effects are
- Increase in speed, slow ships will be fast and will count as fast for branching rules. It is also assumed that fast+ and fastest will have their own branching rules in the future.
- Currently, it is unknown if there is an increase in evasion because of a higher speed and/or the engine synergy.
| Synergy effects | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| +13 boilers | +10 boilers | Group/Speed | Equipment evasion |
Slots required | ||||||
| Fast A | Fast B1 | Fast B2 | Fast C | Slow A | Slow B | Slow C | ||||
| 0 | 1 | Fast+ | Fast+ | Fast+ | Fast+ | Fast | Fast | Fast | 16 | 2 |
| 0 | 2 | Fastest | Fast+ | Fast+ | Fast+ | Fast | Fast | Fast | 26 | 3 |
| 0 | 3 | Fastest | Fast+ | Fastest | Fast+ | Fast | Fast+ | Fast | 36 | 4 |
| 0 | 4 | Fastest | Fast+ | Fastest | Fast+ | Fast | Fast+ | Fast | 46 | 5 |
| 1 | 0 | Fastest | Fast+ | Fast+ | Fast+ | Fast | Fast | Fast | 19 | 2 |
| 1 | 1 | Fastest | Fastest | Fast+ | Fast+ | Fast+ | Fast | Fast | 29 | 3 |
| 1 | 2 | Fastest | Fastest | Fastest | Fast+ | Fastest | Fast+ | Fast | 39 | 4 |
| 1 | 3 | Fastest | Fastest | Fastest | Fast+ | Fastest | Fast+ | Fast | 49 | 5 |
| 2 | 0 | Fastest | Fastest | Fastest | Fast+ | Fast+ | Fast+ | Fast | 32 | 3 |
| 2 | 1 | Fastest | Fastest | Fastest | Fast+ | Fastest | Fast+ | Fast | 42 | 4 |
| 2 | 2 | Fastest | Fastest | Fastest | Fast+ | Fastest | Fast+ | Fast | 52 | 5 |
| 3 | 0 | Fastest | Fastest | Fastest | Fast+ | Fastest | Fast+ | Fast | 45 | 4 |
| 3 | 1 | Fastest | Fastest | Fastest | Fast+ | Fastest | Fast+ | Fast | 55 | 5 |
| 4 | 0 | Fastest | Fastest | Fastest | Fast+ | Fastest | Fast+ | Fast | 58 | 5 |
| Speed groups | ||
|---|---|---|
| Initial speed | Group | Ships, classes, types |
| Fast | A | Shimakaze, Taihou, Shoukaku-class Class, Tone-class Class, Mogami-class Class |
| B1 | Amatsukaze, Agano-class Class, Souryuu, Hiryuu, Unryuu, Amagi, Kongou-class Class, Iowa | |
| B2 | DD, CL, CLT, CA, CVL (Fast), FBB, Akagi, Katsuragi | |
| C | Kaga, Yuubari, AV (Fast) | |
| Slow | A | Yamato-class Class |
| B | BB, BBV, CVL (Slow), AV (Slow), CT, AS | |
| C | SS, SSV, LHA, AR, AO | |