diff --git a/crates/sequencing/papyrus_consensus/src/stream_handler.rs b/crates/sequencing/papyrus_consensus/src/stream_handler.rs
index aef64421c7..7101579dce 100644
--- a/crates/sequencing/papyrus_consensus/src/stream_handler.rs
+++ b/crates/sequencing/papyrus_consensus/src/stream_handler.rs
@@ -1,9 +1,8 @@
 //! Stream handler, see StreamManager struct.
 
 use std::cmp::Ordering;
-use std::collections::btree_map::Entry as BTreeEntry;
-use std::collections::hash_map::Entry as HashMapEntry;
-use std::collections::{BTreeMap, HashMap};
+use std::collections::hash_map::Entry::{Occupied, Vacant};
+use std::collections::HashMap;
 
 use futures::channel::mpsc;
 use futures::StreamExt;
@@ -39,7 +38,7 @@ struct StreamData<
     max_message_id_received: MessageId,
     sender: mpsc::Sender<T>,
     // A buffer for messages that were received out of order.
-    message_buffer: BTreeMap<MessageId, StreamMessage<T>>,
+    message_buffer: HashMap<MessageId, StreamMessage<T>>,
 }
 
 impl<T: Clone + Into<Vec<u8>> + TryFrom<Vec<u8>, Error = ProtobufConversionError>> StreamData<T> {
@@ -49,7 +48,7 @@ impl<T: Clone + Into<Vec<u8>> + TryFrom<Vec<u8>, Error = ProtobufConversionError
             fin_message_id: None,
             max_message_id_received: 0,
             sender,
-            message_buffer: BTreeMap::new(),
+            message_buffer: HashMap::new(),
         }
     }
 }
@@ -232,8 +231,8 @@ impl<T: Clone + Send + Into<Vec<u8>> + TryFrom<Vec<u8>, Error = ProtobufConversi
         let message_id = message.message_id;
 
         let data = match self.inbound_stream_data.entry(key.clone()) {
-            HashMapEntry::Occupied(entry) => entry.into_mut(),
-            HashMapEntry::Vacant(e) => {
+            Occupied(entry) => entry.into_mut(),
+            Vacant(e) => {
                 // If we received a message for a stream that we have not seen before,
                 // we need to create a new receiver for it.
                 let (sender, receiver) = mpsc::channel(CHANNEL_BUFFER_LENGTH);
@@ -309,10 +308,10 @@ impl<T: Clone + Send + Into<Vec<u8>> + TryFrom<Vec<u8>, Error = ProtobufConversi
         let message_id = message.message_id;
 
         match data.message_buffer.entry(message_id) {
-            BTreeEntry::Vacant(e) => {
+            Vacant(e) => {
                 e.insert(message);
             }
-            BTreeEntry::Occupied(_) => {
+            Occupied(_) => {
                 // TODO(guyn): replace warnings with more graceful error handling
                 warn!(
                     "Two messages with the same message_id in buffer! key: {:?}, message_id: {}",
diff --git a/crates/sequencing/papyrus_consensus/src/stream_handler_test.rs b/crates/sequencing/papyrus_consensus/src/stream_handler_test.rs
index 4bd575da8d..c2995108b8 100644
--- a/crates/sequencing/papyrus_consensus/src/stream_handler_test.rs
+++ b/crates/sequencing/papyrus_consensus/src/stream_handler_test.rs
@@ -34,10 +34,16 @@ mod tests {
         StreamMessage { message: content, stream_id, message_id }
     }
 
-    // Check if two vectors are the same:
-    fn do_vecs_match<T: PartialEq>(a: &[T], b: &[T]) -> bool {
-        let matching = a.iter().zip(b.iter()).filter(|&(a, b)| a == b).count();
-        matching == a.len() && matching == b.len()
+    // Check if two vectors are the same, regardless of ordering
+    fn do_vecs_match_unordered<T: PartialEq + Ord + Clone>(a: &Vec<T>, b: &Vec<T>) -> bool
+    where
+        T: std::hash::Hash + Eq,
+    {
+        let mut a = a.clone();
+        a.sort();
+        let mut b = b.clone();
+        b.sort();
+        a == b
     }
 
     async fn send(
@@ -183,7 +189,7 @@ mod tests {
             .message_buffer
             .into_keys()
             .collect();
-        assert!(do_vecs_match(&keys, &range));
+        assert!(do_vecs_match_unordered(&keys, &range));
 
         // Now send the last message:
         send(&mut network_sender, &inbound_metadata, make_test_message(stream_id, 0, false)).await;
@@ -258,7 +264,7 @@ mod tests {
         );
 
         // We have all message from 1 to 9 buffered.
-        assert!(do_vecs_match(
+        assert!(do_vecs_match_unordered(
             &stream_handler.inbound_stream_data[&(peer_id.clone(), stream_id1)]
                 .message_buffer
                 .clone()
@@ -268,7 +274,7 @@ mod tests {
         ));
 
         // We have all message from 1 to 5 buffered.
-        assert!(do_vecs_match(
+        assert!(do_vecs_match_unordered(
             &stream_handler.inbound_stream_data[&(peer_id.clone(), stream_id2)]
                 .message_buffer
                 .clone()
@@ -278,7 +284,7 @@ mod tests {
         ));
 
         // We have all message from 1 to 5 buffered.
-        assert!(do_vecs_match(
+        assert!(do_vecs_match_unordered(
             &stream_handler.inbound_stream_data[&(peer_id.clone(), stream_id3)]
                 .message_buffer
                 .clone()
@@ -486,7 +492,7 @@ mod tests {
         vec1.sort();
         let mut vec2 = vec![&stream_id1, &stream_id2];
         vec2.sort();
-        do_vecs_match(&vec1, &vec2);
+        do_vecs_match_unordered(&vec1, &vec2);
         assert_eq!(stream_handler.outbound_stream_number[&stream_id2], 1);
 
         // Close the first channel.