diff --git a/mvds.nim b/mvds.nim
index 267c3a7..d709137 100644
--- a/mvds.nim
+++ b/mvds.nim
@@ -22,8 +22,5 @@ proc offer*(node: MVDSNode, msg: Message, epoch: int) {.inline.} =
 proc updateEpoch*(node: MVDSNode, msgID: seq[byte], epoch: int): bool =
   node.state.updateEpoch(msgID, epoch)
 
-proc handle*(node: MVDSNode, msg: seq[byte]): tuple[messages: seq[Message], response: seq[byte]] =
-  var payload: Payload = Protobuf.decode(msg, Payload)
-  for msg in payload.messages:
-    msg.hash()
-  return (payload.messages, Protobuf.encode(node.state.handle(payload)))
+proc handle*(node: MVDSNode, payload: Payload): tuple[messages: seq[Message], response: Payload] {.inline.} =
+  (payload.messages, node.state.handle(payload))
diff --git a/mvds/Message.nim b/mvds/Message.nim
index eae93d6..8a75b19 100644
--- a/mvds/Message.nim
+++ b/mvds/Message.nim
@@ -9,7 +9,7 @@ type
     group* {.fieldNumber: 1.}: seq[byte] #Assigned into a group by developer, not protocol.
     time* {.pint, fieldNumber: 2.}: int64
     body* {.fieldNumber: 3.}: seq[byte]
-    id* {.dontSerialize.}: seq[byte]
+    id {.dontSerialize.}: seq[byte]
 
   Payload* = object
     acks* {.fieldNumber: 1.}: seq[seq[byte]]
@@ -17,29 +17,27 @@ type
     requests* {.fieldNumber: 3.}: seq[seq[byte]]
     messages* {.fieldNumber: 4.}: seq[Message]
 
-proc hash*(msg: Message) =
-  msg.id = @(
-    sha256.digest(
-      cast[seq[byte]]("MESSAGE_ID") &
-      msg.group &
-      @(uint64(msg.time).toBytesLE()) &
-      msg.body
-    ).data
-  )
+proc id*(msg: Message): seq[byte] =
+  if msg.id.len == 0:
+    msg.id = @(
+      sha256.digest(
+        cast[seq[byte]]("MESSAGE_ID") &
+        msg.group &
+        @(uint64(msg.time).toBytesLE()) &
+        msg.body
+      ).data
+    )
+  result = msg.id
 
-proc newMessage*(group: seq[byte], body: seq[byte], time: int64 = getTime().toUnix()): Message =
-  result = Message(
+proc newMessage*(group: seq[byte], body: seq[byte], time: int64 = getTime().toUnix()): Message {.inline.} =
+  Message(
     group: group,
     time: time,
     body: body
   )
-  result.hash()
 
 when defined MVDS_TESTS:
   proc `==`*(lhs: Message, rhs: Message): bool {.inline.} =
-    (
-      (lhs.group == rhs.group) and
-      (lhs.time == rhs.time) and
-      (lhs.body == rhs.body) and
-      (lhs.id == rhs.id)
-    )
+    (lhs.group == rhs.group) and
+    (lhs.time == rhs.time) and
+    (lhs.body == rhs.body)
diff --git a/tests/test_batch.nim b/tests/test_batch.nim
index 91d4883..a5fe407 100644
--- a/tests/test_batch.nim
+++ b/tests/test_batch.nim
@@ -14,7 +14,7 @@ suite "Batch":
     var
       alice: MVDSNode = newMVDSNode(false)
       bob: MVDSNode = newMVDSNode(false)
-      res: tuple[messages: seq[Message], response: seq[byte]]
+      res: tuple[messages: seq[Message], response: Payload]
     var
       groupID: seq[byte] = newSeq[byte](rand(100))
       body: seq[byte] = newSeq[byte](rand(500))
@@ -25,11 +25,11 @@ suite "Batch":
     var msg: Message = newMessage(groupID, body)
 
   test "Nothing":
-    check alice.handle(@[]) == res
+    check alice.handle(Payload()) == res
 
   test "Single message":
     alice.offer(msg, 0)
-    res = alice.handle(@[])
+    res = alice.handle(Payload())
     check:
       res.messages.len == 0
       alice.state.messages.len == 1
@@ -49,14 +49,14 @@ suite "Batch":
       bob.state.messages.len == 0
 
     check:
-      alice.handle(res.response) == (messages: @[], response: @[])
+      alice.handle(res.response) == (messages: @[], response: Payload())
       alice.state.messages.len == 0
 
   test "No ack":
     alice.offer(msg, 0)
-    var origRes: tuple[messages: seq[Message], response: seq[byte]] = alice.handle(@[])
+    var origRes: tuple[messages: seq[Message], response: Payload] = alice.handle(Payload())
     for i in 2 ..< 7:
-      res = alice.handle(@[])
+      res = alice.handle(Payload())
       check:
         res == origRes
         res.messages.len == 0
@@ -72,13 +72,13 @@ suite "Batch":
 
   test "Epoch manipulation":
     alice.offer(msg, 0)
-    var origRes: tuple[messages: seq[Message], response: seq[byte]] = alice.handle(@[])
+    var origRes: tuple[messages: seq[Message], response: Payload] = alice.handle(Payload())
     check alice.updateEpoch(msg.id, 7)
     for i in 1 ..< 7:
-      res = alice.handle(@[])
+      res = alice.handle(Payload())
       check:
         res.messages.len == 0
-        res.response.len == 0
+        res.response == Payload()
         alice.state.messages.len == 1
         alice.state.messages.hasKey(msg.id)
 
@@ -90,7 +90,7 @@ suite "Batch":
         )
 
     check:
-      alice.handle(@[]) == origRes
+      alice.handle(Payload()) == origRes
       alice.state.messages.len == 1
 
     discard alice.handle(bob.handle(origRes.response).response)
diff --git a/tests/test_interactive.nim b/tests/test_interactive.nim
index da19287..2d3229c 100644
--- a/tests/test_interactive.nim
+++ b/tests/test_interactive.nim
@@ -14,10 +14,10 @@ suite "Interactive":
     var
       alice: MVDSNode = newMVDSNode(true)
       bob: MVDSNode = newMVDSNode(true)
-      res: tuple[messages: seq[Message], response: seq[byte]]
+      res: tuple[messages: seq[Message], response: Payload]
 
   test "Nothing":
-    check alice.handle(@[]) == res
+    check alice.handle(Payload()) == res
 
   test "Single message":
     var
@@ -30,7 +30,7 @@ suite "Interactive":
 
     var msg: Message = newMessage(groupID, body)
     alice.offer(msg, 0)
-    res = alice.handle(@[])
+    res = alice.handle(Payload())
     check:
       res.messages.len == 0
       alice.state.messages.len == 1
@@ -77,5 +77,5 @@ suite "Interactive":
 
     res = alice.handle(res.response)
     check:
-      alice.handle(res.response) == (messages: @[], response: @[])
+      alice.handle(res.response) == (messages: @[], response: Payload())
       alice.state.messages.len == 0