When to Use SlowMo in Glow Spin

The verified effect

SlowMo reduces the ring's rotation speed by 65% while active. Across the 500 shipped level files, it lasts 3 to 6 seconds. The English gameplay control labels it “Slow”; the effect does not change the colour-matching rule.

Timing ideas, not guarantees

A player may want to try it when the ring's current pace feels crowded, when they want a clearer look at the segment positions, or when a current multiplier matters to them. Those are optional ways to approach the configured active window, not a promise about a score.