Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsBecause some games add the forward and sideways movement inputs at full strength. Those perpendicular components combine into a longer diagonal vector: if each has a length of 1, the result is √2, or about 1.414 times as long. That makes diagonal movement roughly 41% faster than moving in either direction alone—unless the game limits or normalizes the combined input.
How two inputs create a faster diagonal
Imagine forward movement as one axis and sideways movement as a perpendicular axis. If each input contributes a movement amount of 1 during the same update, pressing both produces a displacement of (1, 1). Its length is √(1² + 1²) = √2, approximately 1.414. Straight movement has only one component, with length 1, so the combined diagonal covers about 41% more distance per update.
This is a result of vector addition, not a special property of diagonal travel. It applies when a game combines two full-strength directional inputs without scaling them down or capping the resulting movement vector. Godot’s 3.1 movement guide explains the faster diagonal result and demonstrates normalizing the vector to prevent it (Godot’s 8-way movement guide). A Unity movement tutorial describes the same approximately 1.4 ratio (Unity diagonal movement tutorial).
Why games don’t all behave the same way
The calculation depends on how a game handles its movement input. Some systems allow the longer diagonal vector; others normalize it or cap its magnitude so that movement speed stays the same in every direction. A game may also use acceleration or specialized movement rules rather than simply applying an input vector.
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- Equal speed in every direction: The game limits the combined vector, preventing two simultaneous inputs from increasing its magnitude.
- Diagonal speed gain: The game allows both full-strength components to add together.
- Intentional movement technique: Some games make strafe-running or acceleration-based techniques part of their movement system. General references describe strafe-running and strafe-jumping, while noting that games differ in whether they cap speed (Strafing in video games).
Without knowing the game, it is not possible to say whether its diagonal speed is a bug, a deliberate feature, or part of a more involved movement technique.
How developers prevent the diagonal boost
Normalize digital movement input
For digital controls such as keyboard directions, a common solution is to normalize the combined input vector before multiplying it by the desired speed. Normalization keeps its direction but sets its length to 1, so a diagonal input no longer moves faster than a straight input. Godot’s 3.1 guide demonstrates this approach for eight-way movement (Godot’s 8-way movement guide).
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Analog sticks can produce partial inputs. Normalizing every nonzero stick vector would turn even a slight tilt into full-strength movement. Instead, developers can clamp the vector’s maximum magnitude to 1: full-strength input stays within the limit, while shorter input retains its lower magnitude. The cited Unity tutorial describes this distinction and shows Vector3.ClampMagnitude as an option (Unity diagonal movement tutorial).
The appropriate choice depends on the control scheme and movement rules, including whether the game needs to preserve partial stick input or uses acceleration.
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