diff --git a/apps/smp-server/Main.hs b/apps/smp-server/Main.hs
index 7e7438867..51e208cb7 100644
--- a/apps/smp-server/Main.hs
+++ b/apps/smp-server/Main.hs
@@ -26,7 +26,7 @@ logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
 
 main :: IO ()
 main = do
-  setLogLevel LogInfo
+  setLogLevel LogDebug
   withGlobalLogging logCfg . protocolServerCLI smpServerCLIConfig $ \cfg@ServerConfig {inactiveClientExpiration} -> do
     putStrLn $ case inactiveClientExpiration of
       Just ExpirationConfig {ttl, checkInterval} -> "expiring clients inactive for " <> show ttl <> " seconds every " <> show checkInterval <> " seconds"
diff --git a/package.yaml b/package.yaml
index b68489751..5727ad9c0 100644
--- a/package.yaml
+++ b/package.yaml
@@ -1,5 +1,5 @@
 name: simplexmq
-version: 3.3.0
+version: 3.3.1
 synopsis: SimpleXMQ message broker
 description: |
   This package includes <./docs/Simplex-Messaging-Server.html server>,
diff --git a/simplexmq.cabal b/simplexmq.cabal
index c371fbd23..6cea0f677 100644
--- a/simplexmq.cabal
+++ b/simplexmq.cabal
@@ -5,7 +5,7 @@ cabal-version: 1.12
 -- see: https://github.com/sol/hpack
 
 name:           simplexmq
-version:        3.3.0
+version:        3.3.1
 synopsis:       SimpleXMQ message broker
 description:    This package includes <./docs/Simplex-Messaging-Server.html server>,
                 <./docs/Simplex-Messaging-Client.html client> and
diff --git a/src/Simplex/Messaging/Notifications/Server.hs b/src/Simplex/Messaging/Notifications/Server.hs
index 063aa8236..ae3fd1772 100644
--- a/src/Simplex/Messaging/Notifications/Server.hs
+++ b/src/Simplex/Messaging/Notifications/Server.hs
@@ -205,7 +205,6 @@ ntfSubscriber NtfSubscriber {smpSubscribers, newSubQ, smpAgent = ca@SMPClientAge
           incNtfStat ntfReceived
         SMP.END -> updateSubStatus smpQueue NSEnd
         _ -> pure ()
-      pure ()
 
     receiveAgent =
       forever $
diff --git a/src/Simplex/Messaging/Server.hs b/src/Simplex/Messaging/Server.hs
index e64240dcd..bbacfa4d1 100644
--- a/src/Simplex/Messaging/Server.hs
+++ b/src/Simplex/Messaging/Server.hs
@@ -41,6 +41,7 @@ import Control.Monad.IO.Unlift
 import Control.Monad.Reader
 import Crypto.Random
 import Data.Bifunctor (first)
+import Data.ByteString.Base64 (encode)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Either (fromRight, partitionEithers)
@@ -321,7 +322,7 @@ dummyKeyEd448 :: C.PublicKey 'C.Ed448
 dummyKeyEd448 = "MEMwBQYDK2VxAzoA6ibQc9XpkSLtwrf7PLvp81qW/etiumckVFImCMRdftcG/XopbOSaq9qyLhrgJWKOLyNrQPNVvpMA"
 
 client :: forall m. (MonadUnliftIO m, MonadReader Env m) => Client -> Server -> m ()
-client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Server {subscribedQ, ntfSubscribedQ, notifiers} =
+client clnt@Client {thVersion, sessionId, subscriptions, ntfSubscriptions, rcvQ, sndQ} Server {subscribedQ, ntfSubscribedQ, notifiers} =
   forever $
     atomically (readTBQueue rcvQ)
       >>= mapM processCommand
@@ -432,7 +433,7 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
           okResp <$> atomically (suspendQueue st queueId)
 
         subscribeQueue :: QueueRec -> RecipientId -> m (Transmission BrokerMsg)
-        subscribeQueue qr rId =
+        subscribeQueue qr rId = timed "subscribe" sessionId rId $ do
           atomically (TM.lookup rId subscriptions) >>= \case
             Nothing ->
               atomically newSub >>= deliver
@@ -496,7 +497,7 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
           pure ok
 
         acknowledgeMsg :: QueueRec -> MsgId -> m (Transmission BrokerMsg)
-        acknowledgeMsg qr msgId = do
+        acknowledgeMsg qr msgId = timed "ack" sessionId queueId $ do
           atomically (TM.lookup queueId subscriptions) >>= \case
             Nothing -> pure $ err NO_MSG
             Just sub ->
@@ -540,7 +541,7 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
                   ServerConfig {messageExpiration, msgQueueQuota} <- asks config
                   old <- liftIO $ mapM expireBeforeEpoch messageExpiration
                   ntfNonceDrg <- asks idsDrg
-                  resp@(_, _, sent) <- atomically $ do
+                  resp@(_, _, sent) <- timed "send" sessionId queueId . atomically $ do
                     q <- getMsgQueue ms (recipientId qr) msgQueueQuota
                     mapM_ (deleteExpiredMsgs q) old
                     ifM (isFull q) (pure $ err QUOTA) $ do
@@ -566,7 +567,7 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
 
             writeNtf :: NotifierId -> Message -> RcvNtfDhSecret -> TVar ChaChaDRG -> Client -> STM ()
             writeNtf nId msg rcvNtfDhSecret ntfNonceDrg Client {sndQ = q} =
-              unlessM (isFullTBQueue sndQ) $ do
+              unlessM (isFullTBQueue q) $ do
                 (nmsgNonce, encNMsgMeta) <- mkMessageNotification msg rcvNtfDhSecret ntfNonceDrg
                 writeTBQueue q [(CorrId "", nId, NMSG nmsgNonce encNMsgMeta)]
 
@@ -578,7 +579,7 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
               pure . (cbNonce,) $ fromRight "" encNMsgMeta
 
         deliverMessage :: QueueRec -> RecipientId -> TVar Sub -> MsgQueue -> Maybe Message -> m (Transmission BrokerMsg)
-        deliverMessage qr rId sub q msg_ = do
+        deliverMessage qr rId sub q msg_ = timed "deliver" sessionId rId $ do
           readTVarIO sub >>= \case
             s@Sub {subThread = NoSub} ->
               case msg_ of
@@ -596,13 +597,14 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
                 s@Sub {subThread = SubPending} -> s {subThread = SubThread t}
                 s -> s
               where
-                subscriber = atomically $ do
-                  msg <- peekMsg q
-                  let encMsg = encryptMsg qr msg
-                  writeTBQueue sndQ [(CorrId "", rId, MSG encMsg)]
-                  s <- readTVar sub
-                  void $ setDelivered s msg
-                  writeTVar sub s {subThread = NoSub}
+                subscriber = do
+                  msg <- atomically $ peekMsg q
+                  timed "subscriber" sessionId rId . atomically $ do
+                    let encMsg = encryptMsg qr msg
+                    writeTBQueue sndQ [(CorrId "", rId, MSG encMsg)]
+                    s <- readTVar sub
+                    void $ setDelivered s msg
+                    writeTVar sub s {subThread = NoSub}
 
         encryptMsg :: QueueRec -> Message -> RcvMessage
         encryptMsg qr Message {msgId, msgTs, msgFlags, msgBody}
@@ -648,6 +650,18 @@ withLog action = do
   env <- ask
   liftIO . mapM_ action $ storeLog (env :: Env)
 
+timed :: MonadUnliftIO m => T.Text -> ByteString -> RecipientId -> m a -> m a
+timed name sessId qId a = do
+  t <- liftIO getSystemTime
+  r <- a
+  t' <- liftIO getSystemTime
+  let int = diff t t'
+  when (int > sec) . logDebug $ T.unwords [name, tshow $ encode sessId, tshow $ encode qId, tshow int]
+  pure r
+  where
+    diff t t' = (systemSeconds t' - systemSeconds t) * sec + fromIntegral (systemNanoseconds t' - systemNanoseconds t)
+    sec = 1000_000000
+
 randomId :: (MonadUnliftIO m, MonadReader Env m) => Int -> m ByteString
 randomId n = do
   gVar <- asks idsDrg
diff --git a/src/Simplex/Messaging/Transport.hs b/src/Simplex/Messaging/Transport.hs
index a012c5c9a..f95979208 100644
--- a/src/Simplex/Messaging/Transport.hs
+++ b/src/Simplex/Messaging/Transport.hs
@@ -99,7 +99,7 @@ supportedSMPServerVRange :: VersionRange
 supportedSMPServerVRange = mkVersionRange 1 4
 
 simplexMQVersion :: String
-simplexMQVersion = "3.3.0"
+simplexMQVersion = "3.3.1"
 
 -- * Transport connection class
 
diff --git a/tests/AgentTests/NotificationTests.hs b/tests/AgentTests/NotificationTests.hs
index 74ca9bcc9..d340a3522 100644
--- a/tests/AgentTests/NotificationTests.hs
+++ b/tests/AgentTests/NotificationTests.hs
@@ -270,9 +270,9 @@ testNotificationSubscriptionNewConnection APNSMockServer {apnsQ} = do
   bob <- getSMPAgentClient agentCfg {database = testDB2} initAgentServers
   Right () <- runExceptT $ do
     -- alice registers notification token
-    _ <- registerTestToken alice "abcd" NMInstant apnsQ
+    DeviceToken {} <- registerTestToken alice "abcd" NMInstant apnsQ
     -- bob registers notification token
-    _ <- registerTestToken bob "bcde" NMInstant apnsQ
+    DeviceToken {} <- registerTestToken bob "bcde" NMInstant apnsQ
     -- establish connection
     liftIO $ threadDelay 50000
     (bobId, qInfo) <- createConnection alice True SCMInvitation Nothing
@@ -512,7 +512,7 @@ testSwitchNotifications servers APNSMockServer {apnsQ} = do
 
 messageNotification :: TBQueue APNSMockRequest -> ExceptT AgentErrorType IO (C.CbNonce, ByteString)
 messageNotification apnsQ = do
-  1000000 `timeout` atomically (readTBQueue apnsQ) >>= \case
+  750000 `timeout` atomically (readTBQueue apnsQ) >>= \case
     Nothing -> error "no notification"
     Just APNSMockRequest {notification = APNSNotification {aps = APNSMutableContent {}, notificationData = Just ntfData}, sendApnsResponse} -> do
       nonce <- C.cbNonce <$> ntfData .-> "nonce"