diff --git a/src/mind/unconscious.rs b/src/mind/unconscious.rs
index fdcfaed..009e80f 100644
--- a/src/mind/unconscious.rs
+++ b/src/mind/unconscious.rs
@@ -187,17 +187,14 @@ impl Unconscious {
         }
 
         let running = self.agents.iter().filter(|a| a.is_running()).count();
-        if running >= self.max_concurrent { return; }
-        let slots = self.max_concurrent - running;
-
-        let ready: Vec<usize> = self.agents.iter().enumerate()
-            .filter(|(_, a)| a.should_run())
-            .map(|(i, _)| i)
-            .take(slots)
-            .collect();
-
-        for idx in ready {
-            self.spawn_agent(idx).await;
+        for _ in running..self.max_concurrent {
+            let next = self.agents.iter().enumerate()
+                .filter(|(_, a)| a.should_run())
+                .min_by_key(|(_, a)| a.last_run);
+            match next {
+                Some((idx, _)) => self.spawn_agent(idx).await,
+                None => break,
+            }
         }
     }