Answer: In Boss Lab, every attachment slows your robot down, even when the build is under the body's weight limit. Movement loses the total attachment weight divided by 40, rounded down, and then body and support effects adjust the result. If your boss feels sluggish, swap out the heaviest part that isn't helping in this particular matchup (Boss Lab on Google Play).
Disclosure: I'm part of Boss Lab Studio, the independent team behind Boss Lab, an Android robot-building auto-battler. Art and audio are AI-assisted; design, code and balancing are by the team. Android-only, free to play with in-app purchases, needs an internet connection.
This is a rewrite of our original weight and mobility guide.
Legal is not the same as fast
- Legal: the build fits the body's carrying capacity and has owned, compatible parts, a mobility module and at least one weapon. An overweight or incomplete draft stays editable in the Workshop but can't enter battle.
- Fast: this one is about the penalty. The game subtracts floor(total attachment weight / 40) from the mobility module's base movement, but never drops below one before other modifiers. Crossing a multiple of 40 can slow you down even though the build still fits.
Other reasons a robot looks slow
- Chassis bonuses, Thruster, Afterburner, pursuit behavior and phase effects all change effective speed.
- Enemy pulls, drag and knockback can make a healthy robot look slow.
- Losing the mobility attachment drops movement to a much weaker baseline.
- Turning takes time too. A different body can change how fast you face the target, even with the same legs or wheels. The mobility guide compares the options.
Cut weight with a purpose
If a heavy defense never blocks the damage that beats you, a lighter part may let your weapons start firing sooner. If you already hold range, trading durability for speed may not help at all. Compare contact time, firing time and survival in battle.
FAQ
Is there an engineering budget cap? Not in the current build validator. Engineering cost isn't weight; go by the Workshop's carrying total and warnings.
More guides at bosslab.xyz.
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