Honkai Star Rail Speed Threshold Explained: Why Can’t Your Characters Double Act First Turn

Speed Threshold Deep Dive: Why Can’t Your Characters Ever Get Two Actions on the First Turn?

Have you ever dumped tons of resources into stacking a character’s speed to the maximum, only to watch them still fail to get two actions in the critical first round of battle, just like you planned? This frustration comes from a hidden mechanic that most players misunderstand: “speed thresholds”. This isn’t a simple “faster speed = more turns” system — it’s precise math. When you think that missing just a little speed doesn’t matter, you’ve actually already missed out on that extra action you wanted. This guide will fully break down the logic behind speed and action values, so you stop blindly stacking raw stats and start building the perfect speed setup that hits your tactical goals, letting you take full control of battle pace.

Action Value: The Hidden Rule That Determines Turn Order

In most turn-based games, it isn’t the visible “speed” stat on your character sheet that determines turn order — it’s a hidden meter called Action Value (AV). You can think of the battle as a race along a track of fixed length, with all characters running at the same time, and action value represents how far each character still has to go to reach the finish line. The first character whose action value hits zero gets to act. Speed is used to calculate your starting action value, with the standard formula being: Action Value = 10000 ÷ Speed. This inverse relationship is the foundation of everything: the higher your character’s speed, the lower their starting action value, meaning they finish the race faster and get to act first.

Let’s use a concrete example. Suppose Character A has 140 speed, and Character B has 110 speed. When combat starts, Character A’s starting action value is 10000 ÷ 140 ≈ 71.4, while Character B’s starting action value is 10000 ÷ 110 ≈ 90.9. Once the timer starts, Character A only needs 71.4 points of action value to act, while Character B has to wait the full 90.9 points. This explains why even a small difference in speed can lead to a completely different turn order. After Character A acts, their action value resets based on their speed (adding another 71.4 points), and they go back to racing alongside everyone else on the field. This mechanic is the core foundation for our discussion of getting two actions on the first turn.

Because of this, understanding action value is the first step to mastering speed optimization.

Speed Threshold Decoded: The Math Behind First Turn Double Action

Now that we understand action value, we can lift the veil on “speed thresholds”. A threshold is the minimum speed you need to hit to get a specific number of actions within a specific battle cycle. The most sought-after threshold by far is getting a double action on the first turn. In most challenging content in Honkai: Star Rail, like the Forgotten Hall’s Memory of Chaos, the total action value allocated to the first round is usually 150, while every subsequent round has a total of 100 action points. This means that for a character to act twice in the first round, the sum of their first action cost and their second action cost must be ≤ 150.

Let’s walk through a common example: a player wants their main damage dealer to get two full actions off right at the start of the fight. If the character has 134 speed, their action value is 10000 ÷ 134 ≈ 74.63. The first action uses 74.63 action value, leaving 150 – 74.63 = 75.37 action value remaining in the first round. After the character acts, their action value resets to 74.63. Since 74.63 is less than the remaining 75.37, they get to act a second time immediately. The total cost for both actions is 74.63 + 74.63 = 149.26, which falls just under the 150 limit! But what if the character only has 133 speed? Their action value becomes 10000 ÷ 133 ≈ 75.19, so the total cost for two actions is 150.38, which goes just over the first round’s total. This pushes the second action all the way into the next round. This is the core of how thresholds work: 134 speed becomes the golden benchmark for first turn double action.

Chasing first turn double action isn’t about blindly stacking as much speed as possible — it’s about hitting or just exceeding the specific threshold you need.

Practical Build Guide: How To Precisely Hit Your Speed Target

Once you know your target threshold, the next step is fine-tuning your character’s speed to hit it in actual combat. This requires you to consider all factors: your character’s relics, their light cone, and your team composition. The most consistent and largest source of speed is the main stat on your boot slot relic, which gives you a huge chunk of flat speed directly. Next up is the speed substat that can appear on any relic, which is the key to fine-tuning your speed to hit the right threshold. Getting the right speed substats requires spending tons of stamina to farm relics, and hoping that you don’t get unlucky off-level upgrades when you strengthen them. Additionally, specific relic set bonuses, like the 4-piece Messenger Traversing Hackerspace set, give the entire team a speed boost after the character uses their Ultimate, which is a great way to help hit your target threshold.

Let’s look at a second example: support character speed setups are all about tactical team synergy. For example, a popular playstyle for Bronya, a support who can pull a character forward to act immediately, is to tune her speed to be just a little slower than your main damage dealer. This way, after your damage dealer acts, Bronya acts right after and uses her skill to let the damage dealer act again immediately, effectively getting a double action in one round for massive burst damage. In another case, support characters like Asta need to stack speed themselves so they can use their team-wide speed boost Ultimate more often. This helps all your team members, especially slower damage dealers, cross their key speed thresholds and smooth out your entire team’s turn rotation.

A successful speed setup comes from considering relics, light cones, and team support buffs all together.

The Cost Of Speed: Trading Other Stats For Thresholds

When you’re fixated on hitting popular high speed thresholds like 134, 143, or 161, you have to stop and ask one question: what are you giving up to hit that speed? In current Honkai: Star Rail design, the main stat on your boot relic is a choice between speed or percentage attack (or percentage HP/defense). Choosing speed boots means you immediately give up roughly 43.2% extra attack, which has a huge impact on a damage dealer’s total output. Similarly, to get extra speed from substats, you’ll often have to pass on perfect relics that have great crit rate and crit damage, leaving your character’s final damage stat sheet much weaker than it could be.

The right choice for this tradeoff depends entirely on what kind of fight you’re building for. For players chasing a zero-turn clear of challenging content, getting multiple actions off right at the start to break enemy toughness and clear out trash mobs quickly is the best strategy. In this scenario, trading attack for an extra action is well worth it. But for long, drawn-out fights that go multiple rounds, a slower character with higher attack and better crit stats will hit way harder per action, even if they act less often. When you add up total damage over the whole fight, they often outperform a high speed, low attack build. Because of this, don’t fall into the “speed is everything” trap — make your choice based on your character’s role and what your team needs.

The best speed isn’t the highest possible speed — it’s the sweet spot between hitting key thresholds and maintaining your core damage or survival stats.

To sum up, speed is one of the most strategically deep stats in the game. It doesn’t follow a simple linear growth pattern — instead, it forms discrete “thresholds” based on action values and battle cycles. Understanding why 134 speed gets you a first turn double action is far more valuable than blindly chasing 160 speed. Once you master the concept of thresholds, you’ll stop passively farming relics and start actively planning your builds, creating the optimal turn order customized for your team. This doesn’t just let you handle high-difficulty content more easily — it also lets you enjoy the deep strategic gameplay that makes the game fun. Now, start by checking your character’s stat sheet, and take your first step toward becoming a speed optimization master.

• Check Your Main Characters: First, pick the character you want to optimize most (main DPS or core support), and calculate their actual total speed in combat including all buffs.
• Set A Clear Threshold Goal: Based on your team’s needs, pick a realistic target, such as “first turn double action” (around 134 speed) or “three actions in two turns” (around 121 speed), instead of blindly chasing the highest possible speed.
• Simulate And Adjust Your Build: Use third-party build calculators or tools to simulate stat changes when you swap relics or light cones. Find the best setup that hits your speed threshold while sacrificing as little attack, crit, and other key stats as possible.