proper for loop

src/main.rs

@@ -25,10 +25,10 @@ struct BoidBundle {
     boid: Boid,
 }
 
-fn move_boids(mut boids: Query<(&mut Transform, &Velocity), With<Boid>>) {
+fn move_boids(mut boids: Query<(&mut Transform, &Velocity), With<Boid>>, time: Res<Time>) {
-    boids.iter_mut().for_each(|(mut transform, velocity)| {
+    for (mut transform, velocity) in &mut boids {
-        transform.translation += velocity.0;
+        transform.translation += velocity.0 * time.delta_seconds();
-    });
+    }
 }
 
 fn setup(
@@ -47,7 +47,7 @@ fn setup(
             transform: Transform::from_scale(Vec3::splat(2.5)),
             ..default()
         },
-        velocity: Velocity(Vec3::Y),
+        velocity: Velocity(Vec3::Y * 25.),
         ..default()
     });
 }