diff --git a/src/database/rooms.rs b/src/database/rooms.rs
index 0f422350..c53fa9ea 100644
--- a/src/database/rooms.rs
+++ b/src/database/rooms.rs
@@ -88,7 +88,7 @@ pub struct Rooms {
     pub(super) referencedevents: Arc<dyn Tree>,
 
     pub(super) pdu_cache: Mutex<LruCache<EventId, Arc<PduEvent>>>,
-    pub(super) auth_chain_cache: Mutex<LruCache<Vec<EventId>, HashSet<EventId>>>,
+    pub(super) auth_chain_cache: Mutex<LruCache<u64, HashSet<u64>>>,
 }
 
 impl Rooms {
@@ -315,19 +315,7 @@ impl Rooms {
         );
 
         let (shortstatehash, already_existed) =
-            match self.statehash_shortstatehash.get(&state_hash)? {
-                Some(shortstatehash) => (
-                    utils::u64_from_bytes(&shortstatehash)
-                        .map_err(|_| Error::bad_database("Invalid shortstatehash in db."))?,
-                    true,
-                ),
-                None => {
-                    let shortstatehash = db.globals.next_count()?;
-                    self.statehash_shortstatehash
-                        .insert(&state_hash, &shortstatehash.to_be_bytes())?;
-                    (shortstatehash, false)
-                }
-            };
+            self.get_or_create_shortstatehash(&state_hash, &db.globals)?;
 
         let new_state = if !already_existed {
             let mut new_state = HashSet::new();
@@ -352,25 +340,14 @@ impl Rooms {
                         }
                     };
 
-                    let shorteventid =
-                        match self.eventid_shorteventid.get(eventid.as_bytes()).ok()? {
-                            Some(shorteventid) => shorteventid.to_vec(),
-                            None => {
-                                let shorteventid = db.globals.next_count().ok()?;
-                                self.eventid_shorteventid
-                                    .insert(eventid.as_bytes(), &shorteventid.to_be_bytes())
-                                    .ok()?;
-                                self.shorteventid_eventid
-                                    .insert(&shorteventid.to_be_bytes(), eventid.as_bytes())
-                                    .ok()?;
-                                shorteventid.to_be_bytes().to_vec()
-                            }
-                        };
+                    let shorteventid = self
+                        .get_or_create_shorteventid(&eventid, &db.globals)
+                        .ok()?;
 
                     let mut state_id = shortstatehash.to_be_bytes().to_vec();
                     state_id.extend_from_slice(&shortstatekey);
 
-                    Some((state_id, shorteventid))
+                    Some((state_id, shorteventid.to_be_bytes().to_vec()))
                 })
                 .collect::<Vec<_>>();
 
@@ -428,6 +405,61 @@ impl Rooms {
         Ok(())
     }
 
+    /// Returns (shortstatehash, already_existed)
+    fn get_or_create_shortstatehash(
+        &self,
+        state_hash: &StateHashId,
+        globals: &super::globals::Globals,
+    ) -> Result<(u64, bool)> {
+        Ok(match self.statehash_shortstatehash.get(&state_hash)? {
+            Some(shortstatehash) => (
+                utils::u64_from_bytes(&shortstatehash)
+                    .map_err(|_| Error::bad_database("Invalid shortstatehash in db."))?,
+                true,
+            ),
+            None => {
+                let shortstatehash = globals.next_count()?;
+                self.statehash_shortstatehash
+                    .insert(&state_hash, &shortstatehash.to_be_bytes())?;
+                (shortstatehash, false)
+            }
+        })
+    }
+
+    /// Returns (shortstatehash, already_existed)
+    pub fn get_or_create_shorteventid(
+        &self,
+        event_id: &EventId,
+        globals: &super::globals::Globals,
+    ) -> Result<u64> {
+        Ok(match self.eventid_shorteventid.get(event_id.as_bytes())? {
+            Some(shorteventid) => utils::u64_from_bytes(&shorteventid)
+                .map_err(|_| Error::bad_database("Invalid shorteventid in db."))?,
+            None => {
+                let shorteventid = globals.next_count()?;
+                self.eventid_shorteventid
+                    .insert(event_id.as_bytes(), &shorteventid.to_be_bytes())?;
+                self.shorteventid_eventid
+                    .insert(&shorteventid.to_be_bytes(), event_id.as_bytes())?;
+                shorteventid
+            }
+        })
+    }
+
+    pub fn get_eventid_from_short(&self, shorteventid: u64) -> Result<EventId> {
+        let bytes = self
+            .shorteventid_eventid
+            .get(&shorteventid.to_be_bytes())?
+            .ok_or_else(|| Error::bad_database("Shorteventid does not exist"))?;
+
+        EventId::try_from(
+            utils::string_from_bytes(&bytes).map_err(|_| {
+                Error::bad_database("EventID in roomid_pduleaves is invalid unicode.")
+            })?,
+        )
+        .map_err(|_| Error::bad_database("EventId in roomid_pduleaves is invalid."))
+    }
+
     /// Returns the full room state.
     #[tracing::instrument(skip(self))]
     pub fn room_state_full(
@@ -1116,17 +1148,7 @@ impl Rooms {
         state: &StateMap<Arc<PduEvent>>,
         globals: &super::globals::Globals,
     ) -> Result<()> {
-        let shorteventid = match self.eventid_shorteventid.get(event_id.as_bytes())? {
-            Some(shorteventid) => shorteventid.to_vec(),
-            None => {
-                let shorteventid = globals.next_count()?;
-                self.eventid_shorteventid
-                    .insert(event_id.as_bytes(), &shorteventid.to_be_bytes())?;
-                self.shorteventid_eventid
-                    .insert(&shorteventid.to_be_bytes(), event_id.as_bytes())?;
-                shorteventid.to_be_bytes().to_vec()
-            }
-        };
+        let shorteventid = self.get_or_create_shorteventid(&event_id, globals)?;
 
         let state_hash = self.calculate_hash(
             &state
@@ -1135,69 +1157,45 @@ impl Rooms {
                 .collect::<Vec<_>>(),
         );
 
-        let shortstatehash = match self.statehash_shortstatehash.get(&state_hash)? {
-            Some(shortstatehash) => {
-                // State already existed in db
-                self.shorteventid_shortstatehash
-                    .insert(&shorteventid, &*shortstatehash)?;
-                return Ok(());
-            }
-            None => {
-                let shortstatehash = globals.next_count()?;
-                self.statehash_shortstatehash
-                    .insert(&state_hash, &shortstatehash.to_be_bytes())?;
-                shortstatehash.to_be_bytes().to_vec()
-            }
-        };
+        let (shortstatehash, already_existed) =
+            self.get_or_create_shortstatehash(&state_hash, globals)?;
 
-        let batch = state
-            .iter()
-            .filter_map(|((event_type, state_key), pdu)| {
-                let mut statekey = event_type.as_ref().as_bytes().to_vec();
-                statekey.push(0xff);
-                statekey.extend_from_slice(&state_key.as_bytes());
-
-                let shortstatekey = match self.statekey_shortstatekey.get(&statekey).ok()? {
-                    Some(shortstatekey) => shortstatekey.to_vec(),
-                    None => {
-                        let shortstatekey = globals.next_count().ok()?;
-                        self.statekey_shortstatekey
-                            .insert(&statekey, &shortstatekey.to_be_bytes())
-                            .ok()?;
-                        shortstatekey.to_be_bytes().to_vec()
-                    }
-                };
+        if !already_existed {
+            let batch = state
+                .iter()
+                .filter_map(|((event_type, state_key), pdu)| {
+                    let mut statekey = event_type.as_ref().as_bytes().to_vec();
+                    statekey.push(0xff);
+                    statekey.extend_from_slice(&state_key.as_bytes());
 
-                let shorteventid = match self
-                    .eventid_shorteventid
-                    .get(pdu.event_id.as_bytes())
-                    .ok()?
-                {
-                    Some(shorteventid) => shorteventid.to_vec(),
-                    None => {
-                        let shorteventid = globals.next_count().ok()?;
-                        self.eventid_shorteventid
-                            .insert(pdu.event_id.as_bytes(), &shorteventid.to_be_bytes())
-                            .ok()?;
-                        self.shorteventid_eventid
-                            .insert(&shorteventid.to_be_bytes(), pdu.event_id.as_bytes())
-                            .ok()?;
-                        shorteventid.to_be_bytes().to_vec()
-                    }
-                };
+                    let shortstatekey = match self.statekey_shortstatekey.get(&statekey).ok()? {
+                        Some(shortstatekey) => shortstatekey.to_vec(),
+                        None => {
+                            let shortstatekey = globals.next_count().ok()?;
+                            self.statekey_shortstatekey
+                                .insert(&statekey, &shortstatekey.to_be_bytes())
+                                .ok()?;
+                            shortstatekey.to_be_bytes().to_vec()
+                        }
+                    };
 
-                let mut state_id = shortstatehash.clone();
-                state_id.extend_from_slice(&shortstatekey);
+                    let shorteventid = self
+                        .get_or_create_shorteventid(&pdu.event_id, globals)
+                        .ok()?;
 
-                Some((state_id, shorteventid))
-            })
-            .collect::<Vec<_>>();
+                    let mut state_id = shortstatehash.to_be_bytes().to_vec();
+                    state_id.extend_from_slice(&shortstatekey);
+
+                    Some((state_id, shorteventid.to_be_bytes().to_vec()))
+                })
+                .collect::<Vec<_>>();
 
-        self.stateid_shorteventid
-            .insert_batch(&mut batch.into_iter())?;
+            self.stateid_shorteventid
+                .insert_batch(&mut batch.into_iter())?;
+        }
 
         self.shorteventid_shortstatehash
-            .insert(&shorteventid, &*shortstatehash)?;
+            .insert(&shorteventid.to_be_bytes(), &shortstatehash.to_be_bytes())?;
 
         Ok(())
     }
@@ -1212,26 +1210,16 @@ impl Rooms {
         new_pdu: &PduEvent,
         globals: &super::globals::Globals,
     ) -> Result<u64> {
+        let shorteventid = self.get_or_create_shorteventid(&new_pdu.event_id, globals)?;
+
         let old_state = if let Some(old_shortstatehash) =
             self.roomid_shortstatehash.get(new_pdu.room_id.as_bytes())?
         {
             // Store state for event. The state does not include the event itself.
             // Instead it's the state before the pdu, so the room's old state.
-
-            let shorteventid = match self.eventid_shorteventid.get(new_pdu.event_id.as_bytes())? {
-                Some(shorteventid) => shorteventid.to_vec(),
-                None => {
-                    let shorteventid = globals.next_count()?;
-                    self.eventid_shorteventid
-                        .insert(new_pdu.event_id.as_bytes(), &shorteventid.to_be_bytes())?;
-                    self.shorteventid_eventid
-                        .insert(&shorteventid.to_be_bytes(), new_pdu.event_id.as_bytes())?;
-                    shorteventid.to_be_bytes().to_vec()
-                }
-            };
-
             self.shorteventid_shortstatehash
-                .insert(&shorteventid, &old_shortstatehash)?;
+                .insert(&shorteventid.to_be_bytes(), &old_shortstatehash)?;
+
             if new_pdu.state_key.is_none() {
                 return utils::u64_from_bytes(&old_shortstatehash).map_err(|_| {
                     Error::bad_database("Invalid shortstatehash in roomid_shortstatehash.")
@@ -1264,19 +1252,7 @@ impl Rooms {
                 }
             };
 
-            let shorteventid = match self.eventid_shorteventid.get(new_pdu.event_id.as_bytes())? {
-                Some(shorteventid) => shorteventid.to_vec(),
-                None => {
-                    let shorteventid = globals.next_count()?;
-                    self.eventid_shorteventid
-                        .insert(new_pdu.event_id.as_bytes(), &shorteventid.to_be_bytes())?;
-                    self.shorteventid_eventid
-                        .insert(&shorteventid.to_be_bytes(), new_pdu.event_id.as_bytes())?;
-                    shorteventid.to_be_bytes().to_vec()
-                }
-            };
-
-            new_state.insert(shortstatekey, shorteventid);
+            new_state.insert(shortstatekey, shorteventid.to_be_bytes().to_vec());
 
             let new_state_hash = self.calculate_hash(
                 &new_state
@@ -1516,11 +1492,7 @@ impl Rooms {
         );
 
         // Generate short event id
-        let shorteventid = db.globals.next_count()?;
-        self.eventid_shorteventid
-            .insert(pdu.event_id.as_bytes(), &shorteventid.to_be_bytes())?;
-        self.shorteventid_eventid
-            .insert(&shorteventid.to_be_bytes(), pdu.event_id.as_bytes())?;
+        let _shorteventid = self.get_or_create_shorteventid(&pdu.event_id, &db.globals)?;
 
         // We append to state before appending the pdu, so we don't have a moment in time with the
         // pdu without it's state. This is okay because append_pdu can't fail.
@@ -2655,9 +2627,7 @@ impl Rooms {
     }
 
     #[tracing::instrument(skip(self))]
-    pub fn auth_chain_cache(
-        &self,
-    ) -> std::sync::MutexGuard<'_, LruCache<Vec<EventId>, HashSet<EventId>>> {
+    pub fn auth_chain_cache(&self) -> std::sync::MutexGuard<'_, LruCache<u64, HashSet<u64>>> {
         self.auth_chain_cache.lock().unwrap()
     }
 }
diff --git a/src/server_server.rs b/src/server_server.rs
index 68adcd0a..23c80ee6 100644
--- a/src/server_server.rs
+++ b/src/server_server.rs
@@ -1044,13 +1044,16 @@ pub fn handle_incoming_pdu<'a>(
 
         if incoming_pdu.prev_events.len() == 1 {
             let prev_event = &incoming_pdu.prev_events[0];
-            let state = db
+            let prev_event_sstatehash = db
                 .rooms
                 .pdu_shortstatehash(prev_event)
-                .map_err(|_| "Failed talking to db".to_owned())?
-                .map(|shortstatehash| db.rooms.state_full_ids(shortstatehash).ok())
-                .flatten();
-            if let Some(state) = state {
+                .map_err(|_| "Failed talking to db".to_owned())?;
+
+            let state =
+                prev_event_sstatehash.map(|shortstatehash| db.rooms.state_full_ids(shortstatehash));
+
+            if let Some(Ok(state)) = state {
+                warn!("Using cached state");
                 let mut state = fetch_and_handle_events(
                     db,
                     origin,
@@ -1088,6 +1091,7 @@ pub fn handle_incoming_pdu<'a>(
         }
 
         if state_at_incoming_event.is_none() {
+            warn!("Calling /state_ids");
             // Call /state_ids to find out what the state at this pdu is. We trust the server's
             // response to some extend, but we still do a lot of checks on the events
             match db
@@ -1755,35 +1759,50 @@ fn append_incoming_pdu(
 fn get_auth_chain(starting_events: Vec<EventId>, db: &Database) -> Result<HashSet<EventId>> {
     let mut full_auth_chain = HashSet::new();
 
+    let starting_events = starting_events
+        .iter()
+        .map(|id| {
+            (db.rooms
+                .get_or_create_shorteventid(id, &db.globals)
+                .map(|s| (s, id)))
+        })
+        .collect::<Result<Vec<_>>>()?;
+
     let mut cache = db.rooms.auth_chain_cache();
 
-    for event_id in &starting_events {
-        if let Some(cached) = cache.get_mut(&[event_id.clone()][..]) {
+    for (sevent_id, event_id) in starting_events {
+        if let Some(cached) = cache.get_mut(&sevent_id) {
             full_auth_chain.extend(cached.iter().cloned());
         } else {
             drop(cache);
             let mut auth_chain = HashSet::new();
             get_auth_chain_recursive(&event_id, &mut auth_chain, db)?;
             cache = db.rooms.auth_chain_cache();
-            cache.insert(vec![event_id.clone()], auth_chain.clone());
+            cache.insert(sevent_id, auth_chain.clone());
             full_auth_chain.extend(auth_chain);
         };
     }
 
-    Ok(full_auth_chain)
+    full_auth_chain
+        .into_iter()
+        .map(|sid| db.rooms.get_eventid_from_short(sid))
+        .collect()
 }
 
 fn get_auth_chain_recursive(
     event_id: &EventId,
-    found: &mut HashSet<EventId>,
+    found: &mut HashSet<u64>,
     db: &Database,
 ) -> Result<()> {
     let r = db.rooms.get_pdu(&event_id);
     match r {
         Ok(Some(pdu)) => {
             for auth_event in &pdu.auth_events {
-                if !found.contains(auth_event) {
-                    found.insert(auth_event.clone());
+                let sauthevent = db
+                    .rooms
+                    .get_or_create_shorteventid(auth_event, &db.globals)?;
+                if !found.contains(&sauthevent) {
+                    found.insert(sauthevent);
                     get_auth_chain_recursive(&auth_event, found, db)?;
                 }
             }