diff --git a/src/service/sending/send.rs b/src/service/sending/send.rs
index df3139c3..7901de48 100644
--- a/src/service/sending/send.rs
+++ b/src/service/sending/send.rs
@@ -154,7 +154,7 @@ fn sign_request<T>(dest: &ServerName, http_request: &mut http::Request<Vec<u8>>)
 where
 	T: OutgoingRequest + Debug + Send,
 {
-	let mut req_map = serde_json::Map::new();
+	let mut req_map = serde_json::Map::with_capacity(8);
 	if !http_request.body().is_empty() {
 		req_map.insert(
 			"content".to_owned(),
diff --git a/src/service/sending/sender.rs b/src/service/sending/sender.rs
index df41db28..774c3d69 100644
--- a/src/service/sending/sender.rs
+++ b/src/service/sending/sender.rs
@@ -555,8 +555,18 @@ async fn send_events_dest_push(
 async fn send_events_dest_normal(
 	dest: &Destination, server: &OwnedServerName, events: Vec<SendingEvent>,
 ) -> SendingResult {
-	let mut edu_jsons = Vec::new();
-	let mut pdu_jsons = Vec::new();
+	let mut pdu_jsons = Vec::with_capacity(
+		events
+			.iter()
+			.filter(|event| matches!(event, SendingEvent::Pdu(_)))
+			.count(),
+	);
+	let mut edu_jsons = Vec::with_capacity(
+		events
+			.iter()
+			.filter(|event| matches!(event, SendingEvent::Edu(_)))
+			.count(),
+	);
 
 	for event in &events {
 		match event {