diff --git a/app/react/components/particle-worker.js b/app/react/components/particle-worker.js
index 90822ea..73108c3 100644
--- a/app/react/components/particle-worker.js
+++ b/app/react/components/particle-worker.js
@@ -41,25 +41,19 @@ function tick(now) {
   ecs.tick(elapsed);
   emitter.tick(elapsed);
   const update = {};
-  const lastNearby = new Set(memory);
-  for (const id in ecs.$$entities) {
-    const entity = ecs.$$entities[id];
-    if (ecs.$$detached.has(entity.id)) {
-      continue;
+  for (const id in ecs.diff) {
+    if (false === ecs.diff[id]) {
+      memory.delete(id);
+      update[id] = false;
     }
-    lastNearby.delete(id);
-    if (!memory.has(id)) {
-      update[id] = entity.toJSON();
+    else if (!memory.has(id)) {
+      update[id] = ecs.$$entities[id].toJSON();
     }
     else if (ecs.diff[id]) {
       update[id] = ecs.diff[id];
     }
     memory.add(id);
   }
-  for (const id of lastNearby) {
-    memory.delete(id);
-    update[id] = false;
-  }
   if ('1' in update) {
     delete update['1'];
   }