diff --git a/src/bin/syndicate-server.rs b/src/bin/syndicate-server.rs
index 19b587e..6459c41 100644
--- a/src/bin/syndicate-server.rs
+++ b/src/bin/syndicate-server.rs
@@ -121,13 +121,14 @@ async fn run_listener(spaces: Arc<Mutex<spaces::Spaces>>, port: u16) -> UnitAsyn
 }
 
 async fn periodic_tasks(spaces: Arc<Mutex<spaces::Spaces>>) -> UnitAsyncResult {
-    let mut delay = tokio::time::interval(core::time::Duration::from_secs(5));
+    let interval = core::time::Duration::from_secs(5);
+    let mut delay = tokio::time::interval(interval);
     loop {
         delay.next().await.unwrap();
         {
             let mut spaces = spaces.lock().unwrap();
             spaces.cleanup();
-            println!("{}", spaces.summary_string());
+            println!("{}", spaces.stats_string(interval));
         }
     }
 }
diff --git a/src/dataspace.rs b/src/dataspace.rs
index 04de707..2fb1c6e 100644
--- a/src/dataspace.rs
+++ b/src/dataspace.rs
@@ -22,16 +22,57 @@ struct ActorEndpoint {
     assertion: Assertion,
 }
 
+#[derive(Debug)]
+pub struct Churn {
+    pub peers_added: usize,
+    pub peers_removed: usize,
+    pub assertions_added: usize,
+    pub assertions_removed: usize,
+    pub endpoints_added: usize,
+    pub endpoints_removed: usize,
+    pub messages_sent: usize,
+}
+
+impl Churn {
+    pub fn new() -> Self {
+        Self {
+            peers_added: 0,
+            peers_removed: 0,
+            assertions_added: 0,
+            assertions_removed: 0,
+            endpoints_added: 0,
+            endpoints_removed: 0,
+            messages_sent: 0,
+        }
+    }
+
+    pub fn reset(&mut self) {
+        self.peers_added = 0;
+        self.peers_removed = 0;
+        self.assertions_added = 0;
+        self.assertions_removed = 0;
+        self.endpoints_added = 0;
+        self.endpoints_removed = 0;
+        self.messages_sent = 0;
+    }
+}
+
 #[derive(Debug)]
 pub struct Dataspace {
     name: V,
     peers: Map<ConnId, Actor>,
     index: skeleton::Index,
+    pub churn: Churn,
 }
 
 impl Dataspace {
     pub fn new(name: &V) -> Self {
-        Self { name: name.clone(), peers: Map::new(), index: skeleton::Index::new() }
+        Self {
+            name: name.clone(),
+            peers: Map::new(),
+            index: skeleton::Index::new(),
+            churn: Churn::new(),
+        }
     }
 
     pub fn new_ref(name: &V) -> DataspaceRef {
@@ -44,10 +85,12 @@ impl Dataspace {
             tx,
             endpoints: Map::new(),
         });
+        self.churn.peers_added += 1;
     }
 
     pub fn deregister(&mut self, id: ConnId) {
         let ac = self.peers.remove(&id).unwrap();
+        self.churn.peers_removed += 1;
         let mut outbound_turns: Map<ConnId, Vec<packets::Event>> = Map::new();
         for (epname, ep) in ac.endpoints {
             self.remove_endpoint(&mut outbound_turns, id, &epname, ep);
@@ -56,18 +99,6 @@ impl Dataspace {
         self.deliver_outbound_turns(outbound_turns);
     }
 
-    pub fn peer_count(&self) -> usize {
-        self.peers.len()
-    }
-
-    pub fn assertion_count(&self) -> usize {
-        self.index.assertion_count()
-    }
-
-    pub fn endpoint_count(&self) -> isize {
-        self.index.endpoint_count()
-    }
-
     fn remove_endpoint(&mut self,
                        mut outbound_turns: &mut Map<ConnId, Vec<packets::Event>>,
                        id: ConnId,
@@ -81,9 +112,12 @@ impl Dataspace {
                 name: epname.clone(),
             });
         }
+        let old_assertions = self.index.assertion_count();
         schedule_events(&mut outbound_turns,
                         self.index.remove((&assertion).into()),
                         |epname, cs| packets::Event::Del(epname, cs));
+        self.churn.assertions_removed += old_assertions - self.index.assertion_count();
+        self.churn.endpoints_removed += 1;
     }
 
     pub fn turn(&mut self, id: ConnId, actions: Vec<packets::Action>) ->
@@ -113,9 +147,12 @@ impl Dataspace {
                             None
                         };
 
+                    let old_assertions = self.index.assertion_count();
                     schedule_events(&mut outbound_turns,
                                     self.index.insert(assertion.into()),
                                     |epname, cs| packets::Event::Add(epname, cs));
+                    self.churn.assertions_added += self.index.assertion_count() - old_assertions;
+                    self.churn.endpoints_added += 1;
 
                     ac.endpoints.insert(epname.clone(), ActorEndpoint {
                         analysis_results: ar,
@@ -140,6 +177,7 @@ impl Dataspace {
                     schedule_events(&mut outbound_turns,
                                     self.index.send(assertion.into()),
                                     |epname, cs| packets::Event::Msg(epname, cs));
+                    self.churn.messages_sent += 1;
                 }
             }
         }
@@ -152,6 +190,18 @@ impl Dataspace {
             let _ = self.peers.get_mut(&target).unwrap().tx.send(packets::S2C::Turn(events));
         }
     }
+
+    pub fn peer_count(&self) -> usize {
+        self.peers.len()
+    }
+
+    pub fn assertion_count(&self) -> usize {
+        self.index.assertion_count()
+    }
+
+    pub fn endpoint_count(&self) -> isize {
+        self.index.endpoint_count()
+    }
 }
 
 fn schedule_events<C>(outbound_turns: &mut Map<ConnId, Vec<packets::Event>>,
diff --git a/src/spaces.rs b/src/spaces.rs
index a3baf86..d29f209 100644
--- a/src/spaces.rs
+++ b/src/spaces.rs
@@ -38,16 +38,21 @@ impl Spaces {
             .collect();
     }
 
-    pub fn summary_string(&self) -> String {
+    pub fn stats_string(&self, delta: core::time::Duration) -> String {
         let mut v = vec![];
         v.push(format!("{} dataspace(s)", self.index.len()));
         for (dsname, dsref) in &self.index {
-            let ds = dsref.read().unwrap();
-            v.push(format!("  {:?}: {} connection(s), {} assertion(s), {} endpoint(s)",
+            let mut ds = dsref.write().unwrap();
+            v.push(format!("  {:?}: {} connection(s) {}, {} assertion(s) {}, {} endpoint(s) {}, {} messages/sec",
                            dsname,
                            ds.peer_count(),
+                           format!("(+{}/-{})", ds.churn.peers_added, ds.churn.peers_removed),
                            ds.assertion_count(),
-                           ds.endpoint_count()));
+                           format!("(+{}/-{})", ds.churn.assertions_added, ds.churn.assertions_removed),
+                           ds.endpoint_count(),
+                           format!("(+{}/-{})", ds.churn.endpoints_added, ds.churn.endpoints_removed),
+                           ds.churn.messages_sent as f32 / delta.as_secs() as f32));
+            ds.churn.reset();
         }
         v.join("\n")
     }