When enabled, drag-placing only starts only while the grid-fill key ({0}) is held as you press the mouse, so an ordinary click always places a single building instead of starting a drag.

Actual:

Predictive

Maintains the smoothest simulation speed and most consistent framerate by planning ahead how much work fits in each frame.

Speed:

Adaptive simulation speed mode

Controls how the game adapts when the simulation can't reach the target speed.

Uncapped

Always run at the target speed. Framerate may suffer at high speeds.

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