diff --git a/src/service/rooms/pdu_metadata/bundled_aggregations.rs b/src/service/rooms/pdu_metadata/bundled_aggregations.rs
index c47f637a..4ef8efc1 100644
--- a/src/service/rooms/pdu_metadata/bundled_aggregations.rs
+++ b/src/service/rooms/pdu_metadata/bundled_aggregations.rs
@@ -43,10 +43,7 @@ impl super::Service {
 			return Ok(None);
 		}
 
-		// Get the original event for validation of replacement events
-		let original_event = self.services.timeline.get_pdu(event_id).await?;
-
-		let mut replace_events = Vec::with_capacity(relations.len());
+		let mut replace_events = Vec::with_capacity(relations.len().min(10)); // Most events have few replacements
 		let mut reference_events = Vec::with_capacity(relations.len());
 
 		for relation in &relations {
@@ -59,10 +56,7 @@ impl super::Service {
 				if let Some(rel_type) = relates_to.get("rel_type") {
 					match rel_type.as_str() {
 						| Some("m.replace") => {
-							// Only consider valid replacements
-							if Self::is_valid_replacement_event(&original_event, pdu).await? {
-								replace_events.push(relation);
-							}
+							replace_events.push(relation);
 						},
 						| Some("m.reference") => {
 							reference_events.push(relation);
@@ -234,56 +228,6 @@ impl super::Service {
 
 		Ok(())
 	}
-
-	/// Validates that an event is acceptable as a replacement for another event
-	/// See C/S spec "Validity of replacement events"
-	#[tracing::instrument(level = "debug")]
-	async fn is_valid_replacement_event(
-		original_event: &PduEvent,
-		replacement_event: &PduEvent,
-	) -> Result<bool> {
-		// 1. Same room_id
-		if original_event.room_id() != replacement_event.room_id() {
-			return Ok(false);
-		}
-
-		// 2. Same sender
-		if original_event.sender() != replacement_event.sender() {
-			return Ok(false);
-		}
-
-		// 3. Same type
-		if original_event.event_type() != replacement_event.event_type() {
-			return Ok(false);
-		}
-
-		// 4. Neither event should have a state_key property
-		if original_event.state_key().is_some() || replacement_event.state_key().is_some() {
-			return Ok(false);
-		}
-
-		// 5. Original event must not have rel_type of m.replace
-		let original_content = original_event.get_content_as_value();
-		if let Some(relates_to) = original_content.get("m.relates_to") {
-			if let Some(rel_type) = relates_to.get("rel_type") {
-				if rel_type.as_str() == Some("m.replace") {
-					return Ok(false);
-				}
-			}
-		}
-
-		// 6. Replacement event must have m.new_content property
-		// Skip this check for encrypted events, as m.new_content would be inside the
-		// encrypted payload
-		if replacement_event.event_type() != &ruma::events::TimelineEventType::RoomEncrypted {
-			let replacement_content = replacement_event.get_content_as_value();
-			if replacement_content.get("m.new_content").is_none() {
-				return Ok(false);
-			}
-		}
-
-		Ok(true)
-	}
 }
 
 #[cfg(test)]
@@ -447,319 +391,4 @@ mod tests {
 		assert!(result.is_err(), "fails when existing unsigned is invalid");
 		// Should we ignore the error and overwrite anyway?
 	}
-
-	// Test helper function to create test PDU events
-	fn create_test_event(
-		event_id: &str,
-		room_id: &str,
-		sender: &str,
-		event_type: TimelineEventType,
-		content: &JsonValue,
-		state_key: Option<&str>,
-	) -> PduEvent {
-		PduEvent {
-			event_id: event_id.try_into().unwrap(),
-			room_id: room_id.try_into().unwrap(),
-			sender: sender.try_into().unwrap(),
-			origin_server_ts: UInt::try_from(1_234_567_890_u64).unwrap(),
-			kind: event_type,
-			content: to_raw_value(&content).unwrap(),
-			state_key: state_key.map(Into::into),
-			prev_events: vec![],
-			depth: UInt::from(1_u32),
-			auth_events: vec![],
-			redacts: None,
-			unsigned: None,
-			hashes: EventHash { sha256: "test_hash".to_owned() },
-			signatures: None,
-			origin: None,
-		}
-	}
-
-	/// Test that a valid replacement event passes validation
-	#[tokio::test]
-	async fn test_valid_replacement_event() {
-		let original = create_test_event(
-			"$original:example.com",
-			"!room:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomMessage,
-			&json!({"msgtype": "m.text", "body": "original message"}),
-			None,
-		);
-
-		let replacement = create_test_event(
-			"$replacement:example.com",
-			"!room:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomMessage,
-			&json!({
-				"msgtype": "m.text",
-				"body": "* edited message",
-				"m.new_content": {
-					"msgtype": "m.text",
-					"body": "edited message"
-				},
-				"m.relates_to": {
-					"rel_type": "m.replace",
-					"event_id": "$original:example.com"
-				}
-			}),
-			None,
-		);
-
-		let result =
-			super::super::Service::is_valid_replacement_event(&original, &replacement).await;
-		assert!(result.is_ok(), "Validation should succeed");
-		assert!(result.unwrap(), "Valid replacement event should be accepted");
-	}
-
-	/// Test replacement event with different room ID is rejected
-	#[tokio::test]
-	async fn test_replacement_event_different_room() {
-		let original = create_test_event(
-			"$original:example.com",
-			"!room1:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomMessage,
-			&json!({"msgtype": "m.text", "body": "original message"}),
-			None,
-		);
-
-		let replacement = create_test_event(
-			"$replacement:example.com",
-			"!room2:example.com", // Different room
-			"@user:example.com",
-			TimelineEventType::RoomMessage,
-			&json!({
-				"msgtype": "m.text",
-				"body": "* edited message",
-				"m.new_content": {
-					"msgtype": "m.text",
-					"body": "edited message"
-				}
-			}),
-			None,
-		);
-
-		let result =
-			super::super::Service::is_valid_replacement_event(&original, &replacement).await;
-		assert!(result.is_ok(), "Validation should succeed");
-		assert!(!result.unwrap(), "Different room ID should be rejected");
-	}
-
-	/// Test replacement event with different sender is rejected
-	#[tokio::test]
-	async fn test_replacement_event_different_sender() {
-		let original = create_test_event(
-			"$original:example.com",
-			"!room:example.com",
-			"@user1:example.com",
-			TimelineEventType::RoomMessage,
-			&json!({"msgtype": "m.text", "body": "original message"}),
-			None,
-		);
-
-		let replacement = create_test_event(
-			"$replacement:example.com",
-			"!room:example.com",
-			"@user2:example.com", // Different sender
-			TimelineEventType::RoomMessage,
-			&json!({
-				"msgtype": "m.text",
-				"body": "* edited message",
-				"m.new_content": {
-					"msgtype": "m.text",
-					"body": "edited message"
-				}
-			}),
-			None,
-		);
-
-		let result =
-			super::super::Service::is_valid_replacement_event(&original, &replacement).await;
-		assert!(result.is_ok(), "Validation should succeed");
-		assert!(!result.unwrap(), "Different sender should be rejected");
-	}
-
-	/// Test replacement event with different type is rejected
-	#[tokio::test]
-	async fn test_replacement_event_different_type() {
-		let original = create_test_event(
-			"$original:example.com",
-			"!room:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomMessage,
-			&json!({"msgtype": "m.text", "body": "original message"}),
-			None,
-		);
-
-		let replacement = create_test_event(
-			"$replacement:example.com",
-			"!room:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomTopic, // Different event type
-			&json!({
-				"topic": "new topic",
-				"m.new_content": {
-					"topic": "new topic"
-				}
-			}),
-			None,
-		);
-
-		let result =
-			super::super::Service::is_valid_replacement_event(&original, &replacement).await;
-		assert!(result.is_ok(), "Validation should succeed");
-		assert!(!result.unwrap(), "Different event type should be rejected");
-	}
-
-	/// Test replacement event with state key is rejected
-	#[tokio::test]
-	async fn test_replacement_event_with_state_key() {
-		let original = create_test_event(
-			"$original:example.com",
-			"!room:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomName,
-			&json!({"name": "room name"}),
-			Some(""), // Has state key
-		);
-
-		let replacement = create_test_event(
-			"$replacement:example.com",
-			"!room:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomName,
-			&json!({
-				"name": "new room name",
-				"m.new_content": {
-					"name": "new room name"
-				}
-			}),
-			None,
-		);
-
-		let result =
-			super::super::Service::is_valid_replacement_event(&original, &replacement).await;
-		assert!(result.is_ok(), "Validation should succeed");
-		assert!(!result.unwrap(), "Event with state key should be rejected");
-	}
-
-	/// Test replacement of an event that is already a replacement is rejected
-	#[tokio::test]
-	async fn test_replacement_event_original_is_replacement() {
-		let original = create_test_event(
-			"$original:example.com",
-			"!room:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomMessage,
-			&json!({
-				"msgtype": "m.text",
-				"body": "* edited message",
-				"m.relates_to": {
-					"rel_type": "m.replace", // Original is already a replacement
-					"event_id": "$some_other:example.com"
-				}
-			}),
-			None,
-		);
-
-		let replacement = create_test_event(
-			"$replacement:example.com",
-			"!room:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomMessage,
-			&json!({
-				"msgtype": "m.text",
-				"body": "* edited again",
-				"m.new_content": {
-					"msgtype": "m.text",
-					"body": "edited again"
-				}
-			}),
-			None,
-		);
-
-		let result =
-			super::super::Service::is_valid_replacement_event(&original, &replacement).await;
-		assert!(result.is_ok(), "Validation should succeed");
-		assert!(!result.unwrap(), "Replacement of replacement should be rejected");
-	}
-
-	/// Test replacement event missing m.new_content is rejected
-	#[tokio::test]
-	async fn test_replacement_event_missing_new_content() {
-		let original = create_test_event(
-			"$original:example.com",
-			"!room:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomMessage,
-			&json!({"msgtype": "m.text", "body": "original message"}),
-			None,
-		);
-
-		let replacement = create_test_event(
-			"$replacement:example.com",
-			"!room:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomMessage,
-			&json!({
-				"msgtype": "m.text",
-				"body": "* edited message"
-				// Missing m.new_content
-			}),
-			None,
-		);
-
-		let result =
-			super::super::Service::is_valid_replacement_event(&original, &replacement).await;
-		assert!(result.is_ok(), "Validation should succeed");
-		assert!(!result.unwrap(), "Missing m.new_content should be rejected");
-	}
-
-	/// Test encrypted replacement event without m.new_content is accepted
-	#[tokio::test]
-	async fn test_replacement_event_encrypted_missing_new_content_is_valid() {
-		let original = create_test_event(
-			"$original:example.com",
-			"!room:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomEncrypted,
-			&json!({
-				"algorithm": "m.megolm.v1.aes-sha2",
-				"ciphertext": "encrypted_payload_base64",
-				"sender_key": "sender_key",
-				"session_id": "session_id"
-			}),
-			None,
-		);
-
-		let replacement = create_test_event(
-			"$replacement:example.com",
-			"!room:example.com",
-			"@user:example.com",
-			TimelineEventType::RoomEncrypted,
-			&json!({
-				"algorithm": "m.megolm.v1.aes-sha2",
-				"ciphertext": "encrypted_replacement_payload_base64",
-				"sender_key": "sender_key",
-				"session_id": "session_id",
-				"m.relates_to": {
-					"rel_type": "m.replace",
-					"event_id": "$original:example.com"
-				}
-				// No m.new_content in cleartext - this is valid for encrypted events
-			}),
-			None,
-		);
-
-		let result =
-			super::super::Service::is_valid_replacement_event(&original, &replacement).await;
-		assert!(result.is_ok(), "Validation should succeed");
-		assert!(
-			result.unwrap(),
-			"Encrypted replacement without cleartext m.new_content should be accepted"
-		);
-	}
 }