diff --git a/src/world.rs b/src/world.rs
index b0063cb..7143caa 100644
--- a/src/world.rs
+++ b/src/world.rs
@@ -8,7 +8,7 @@ use std::collections::HashMap;
 use std::f32::consts::PI;
 use fastrand;
 
-const ASTEROID_UPDATE_INTERVAL: f32 = 1.0; // seconds
+const ASTEROID_UPDATE_INTERVAL: f32 = 0.1; // seconds
 const ASTEROID_SIZE_FACTOR: f32 = 3.0;
 const STARS_MAX_MAGNITUDE: f32 = 5.5;
 
@@ -182,9 +182,11 @@ fn spawn_despawn_asteroids(
     mut db: ResMut<ActiveAsteroids>,
     asset_server: Res<AssetServer>,
     mut q_asteroid: Query<(Entity, &mut Visibility), With<Asteroid>>,
+    mut last_player_cell: Local<I64Vec3>,
     mut log: ResMut<hud::Log>,
 ) {
     if !timer.0.tick(time.delta()).just_finished()  || q_player.is_empty() {
+    //if q_player.is_empty() {
         return;
     }
     let player = q_player.get_single().unwrap();
@@ -193,6 +195,11 @@ fn spawn_despawn_asteroids(
         (player.y / ASTEROID_SPAWN_STEP).round() as i64,
         (player.z / ASTEROID_SPAWN_STEP).round() as i64,
     );
+    if *last_player_cell == player_cell {
+        return;
+    }
+    *last_player_cell = player_cell;
+
     let mut spawned = 0;
     let mut spawned_near = 0;
     let mut despawned = 0;
@@ -202,6 +209,7 @@ fn spawn_despawn_asteroids(
     let step: f64 = ASTEROID_SPAWN_STEP;
     let stepmax: i64 = (view_radius / step) as i64;
 
+    // Despawn far asteroids
     let x_min = player_cell.x - stepmax;
     let x_max = player_cell.x + stepmax;
     let y_min = player_cell.y - stepmax;