Improve performance

src/history.rs

@@ -269,27 +269,18 @@ impl History {
 
         agent::clean(self.agents.values_mut(), true);
 
-        let mut unique = Vec::with_capacity(100);
+        let mut this_agent = Vec::with_capacity(1024);
 
-        let this_agent = composition
-            .iter()
-            .flatten()
-            .flatten()
-            .filter(|idx| {
-                if !unique.contains(idx) {
-                    unique.push(*idx);
+        for agent in composition.iter().flatten().flatten() {
+            if this_agent.contains(agent) {
+                continue;
+            }
 
-                    return true;
-                }
+            this_agent.push(*agent);
 
-                false
-            })
-            .collect::<Vec<_>>();
-
-        for agent in &this_agent {
             if !self.agents.contains_key(agent) {
                 self.agents.insert(
-                    **agent,
+                    *agent,
                     Agent {
                         player: priors.remove(agent).unwrap_or_else(|| {
                             Player::new(