diff --git a/.cargo/config b/.cargo/config
index a738fb83a0..9aaa76436a 100644
--- a/.cargo/config
+++ b/.cargo/config
@@ -15,7 +15,7 @@ test-voxygen = "run --bin veloren-voxygen --no-default-features --features simd,
 tracy-voxygen = "-Zunstable-options run --bin veloren-voxygen --no-default-features --features tracy,simd,egui-ui --profile no_overflow"
 server = "run --bin veloren-server-cli"
 dbg-voxygen = "run --bin veloren-voxygen -Zunstable-options --profile debuginfo"
-swarm = "run --bin swarm --features client/bin_bot --"
+swarm = "run --bin swarm --features client/bin_bot,client/tick_network --"
 
 
 [env]
diff --git a/client/Cargo.toml b/client/Cargo.toml
index f78a1fa44d..d48889a0b3 100644
--- a/client/Cargo.toml
+++ b/client/Cargo.toml
@@ -9,6 +9,7 @@ simd = ["vek/platform_intrinsics"]
 plugins = ["common-state/plugins"]
 bin_bot = ["common-ecs", "serde", "ron", "clap", "structopt", "rustyline", "common-frontend", "async-channel"]
 tracy = ["common-base/tracy"]
+tick_network = []
 
 default = ["simd"]
 
@@ -58,4 +59,4 @@ required-features = ["bin_bot"]
 
 [[bin]]
 name = "swarm"
-required-features = ["bin_bot"]
+required-features = ["bin_bot", "tick_network"]
diff --git a/client/src/lib.rs b/client/src/lib.rs
index 84c966691f..8fc0059cf3 100644
--- a/client/src/lib.rs
+++ b/client/src/lib.rs
@@ -2484,6 +2484,7 @@ impl Client {
     /// 
     /// The game state is purposefully not simulated to reduce the overhead of running the client.
     /// This method is for use in testing a server with many clients connected.
+    #[cfg(feature = "tick_network")]
     pub fn tick_network(
         &mut self,
         dt: Duration,
diff --git a/common/src/region.rs b/common/src/region.rs
index 4437384f43..9e89579912 100644
--- a/common/src/region.rs
+++ b/common/src/region.rs
@@ -349,14 +349,6 @@ impl RegionMap {
     pub fn iter(&self) -> impl Iterator<Item = (Vec2<i32>, &Region)> {
         self.regions.iter().map(|(key, r)| (*key, r))
     }
-
-    /// Returns a parallel iterator of (Position, Regions)
-    pub fn par_iter(
-        &self,
-    ) -> impl rayon::iter::IndexedParallelIterator<Item = (Vec2<i32>, &Region)> {
-        use rayon::iter::{IntoParallelRefIterator, ParallelIterator};
-        self.regions.par_iter().map(|(key, r)| (*key, r))
-    }
 }
 
 /// Note vd is in blocks in this case
diff --git a/server/src/client.rs b/server/src/client.rs
index f03e44d566..bc45cd45a0 100644
--- a/server/src/client.rs
+++ b/server/src/client.rs
@@ -83,7 +83,11 @@ impl Client {
     }
 
     pub(crate) fn send<M: Into<ServerMsg>>(&self, msg: M) -> Result<(), StreamError> {
-        match msg.into() {
+        // TODO: hack to avoid locking stream mutex while serializing the message,
+        // remove this when the mutexes on the Streams are removed
+        let prepared = self.prepare(msg);
+        self.send_prepared(&prepared)
+        /*match msg.into() {
             ServerMsg::Info(m) => self.register_stream.lock().unwrap().send(m),
             ServerMsg::Init(m) => self.register_stream.lock().unwrap().send(m),
             ServerMsg::RegisterAnswer(m) => self.register_stream.lock().unwrap().send(m),
@@ -133,15 +137,10 @@ impl Client {
                 }
             },
             ServerMsg::Ping(m) => self.ping_stream.lock().unwrap().send(m),
-        }
+        }*/
     }
 
-    pub(crate) fn send_fallible<M: Into<ServerMsg>>(&self, msg: M) {
-        // TODO: hack to avoid locking stream mutex while serializing the message,
-        // remove this when the mutexes on the Streams are removed
-        let prepared = self.prepare(msg);
-        let _ = self.send_prepared(&prepared);
-    }
+    pub(crate) fn send_fallible<M: Into<ServerMsg>>(&self, msg: M) { let _ = self.send(msg); }
 
     pub(crate) fn send_prepared(&self, msg: &PreparedMsg) -> Result<(), StreamError> {
         match msg.stream_id {
diff --git a/server/src/sys/entity_sync.rs b/server/src/sys/entity_sync.rs
index 2b76f73bb6..9810b30954 100644
--- a/server/src/sys/entity_sync.rs
+++ b/server/src/sys/entity_sync.rs
@@ -59,7 +59,7 @@ impl<'a> System<'a> for Sys {
     const PHASE: Phase = Phase::Create;
 
     fn run(
-        _job: &mut Job<Self>,
+        job: &mut Job<Self>,
         (
             entities,
             tick,
@@ -108,14 +108,23 @@ impl<'a> System<'a> for Sys {
 
         // Sync physics and other components
         // via iterating through regions (in parallel)
-        use rayon::iter::ParallelIterator;
+
+        // Pre-collect regions paired with deleted entity list so we can iterate over
+        // them in parallel below
+        let regions_and_deleted_entities = region_map
+            .iter()
+            .map(|(key, region)| (key, region, deleted_entities.take_deleted_in_region(key)))
+            .collect::<Vec<_>>();
+
+        use rayon::iter::{IntoParallelIterator, ParallelIterator};
+        job.cpu_stats.measure(common_ecs::ParMode::Rayon);
         common_base::prof_span!(guard, "regions");
-        region_map.par_iter().for_each_init(
+        regions_and_deleted_entities.into_par_iter().for_each_init(
             || {
                 common_base::prof_span!(guard, "entity sync rayon job");
                 guard
             },
-            |_guard, (key, region)| {
+            |_guard, (key, region, deleted_entities_in_region)| {
                 // Assemble subscriber list for this region by iterating through clients and
                 // checking if they are subscribed to this region
                 let mut subscribers = (
@@ -192,10 +201,7 @@ impl<'a> System<'a> for Sys {
                 let (entity_sync_package, comp_sync_package) = trackers.create_sync_packages(
                     &tracked_comps,
                     region.entities(),
-                    deleted_entities
-                    .get_deleted_in_region(key)
-                    .cloned() // TODO: quick hack to make this parallel, we can avoid this 
-                    .unwrap_or_default(),
+                    deleted_entities_in_region,
                 );
                 // We lazily initialize the the synchronization messages in case there are no
                 // clients.
@@ -300,14 +306,7 @@ impl<'a> System<'a> for Sys {
             },
         );
         drop(guard);
-
-        // TODO: this is a quick hack to make the loop over regions above parallel,
-        // there might is probably a way to make it cleaner
-        //
-        // Remove delete entities for each region that we alread handled above
-        region_map
-            .iter()
-            .for_each(|(key, _)| drop(deleted_entities.take_deleted_in_region(key)));
+        job.cpu_stats.measure(common_ecs::ParMode::Single);
 
         // Update the last physics components for each entity
         for (_, &pos, vel, ori, last_pos, last_vel, last_ori) in (
diff --git a/server/src/sys/sentinel.rs b/server/src/sys/sentinel.rs
index 96ee14cf53..74f77376d0 100644
--- a/server/src/sys/sentinel.rs
+++ b/server/src/sys/sentinel.rs
@@ -430,14 +430,15 @@ impl DeletedEntities {
             .push(uid.into());
     }
 
-    pub fn take_deleted_in_region(&mut self, key: Vec2<i32>) -> Option<Vec<u64>> {
-        self.map.remove(&key)
+    pub fn take_deleted_in_region(&mut self, key: Vec2<i32>) -> Vec<u64> {
+        self.map.remove(&key).unwrap_or_default()
     }
 
-    pub fn get_deleted_in_region(&self, key: Vec2<i32>) -> Option<&Vec<u64>> { self.map.get(&key) }
+    pub fn get_deleted_in_region(&self, key: Vec2<i32>) -> &[u64] {
+        self.map.get(&key).map_or(&[], |v| v.as_slice())
+    }
 
-    pub fn take_remaining_deleted(&mut self) -> Vec<(Vec2<i32>, Vec<u64>)> {
-        // TODO: don't allocate
-        self.map.drain().collect()
+    pub fn take_remaining_deleted(&mut self) -> impl Iterator<Item = (Vec2<i32>, Vec<u64>)> + '_ {
+        self.map.drain()
     }
 }
diff --git a/server/src/sys/subscription.rs b/server/src/sys/subscription.rs
index 43a4329f00..714c762d16 100644
--- a/server/src/sys/subscription.rs
+++ b/server/src/sys/subscription.rs
@@ -161,11 +161,7 @@ impl<'a> System<'a> for Sys {
                     }
                     // Send deleted entities since they won't be processed for this client in entity
                     // sync
-                    for uid in deleted_entities
-                        .get_deleted_in_region(key)
-                        .iter()
-                        .flat_map(|v| v.iter())
-                    {
+                    for uid in deleted_entities.get_deleted_in_region(key).iter() {
                         client.send_fallible(ServerGeneral::DeleteEntity(Uid(*uid)));
                     }
                 }