diff --git a/src/history.rs b/src/history.rs
index 4a09dc4..a5c23bf 100644
--- a/src/history.rs
+++ b/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(
diff --git a/src/message.rs b/src/message.rs
index a340385..a73fb96 100644
--- a/src/message.rs
+++ b/src/message.rs
@@ -15,14 +15,17 @@ impl TeamMessage {
     }
     */
 
+    #[inline]
     pub(crate) fn posterior_win(&self) -> Gaussian {
         self.prior * self.likelihood_lose * self.likelihood_draw
     }
 
+    #[inline]
     pub(crate) fn posterior_lose(&self) -> Gaussian {
         self.prior * self.likelihood_win * self.likelihood_draw
     }
 
+    #[inline]
     pub(crate) fn likelihood(&self) -> Gaussian {
         self.likelihood_win * self.likelihood_lose * self.likelihood_draw
     }