diff --git a/openbr/plugins/process.cpp b/openbr/plugins/process.cpp
index 548fc11..eae69fa 100644
--- a/openbr/plugins/process.cpp
+++ b/openbr/plugins/process.cpp
@@ -349,6 +349,7 @@ public:
         QByteArray data = readArray;
         QDataStream deserializer(data);
         Transform *res = Transform::deserialize(deserializer);
+        sendSignal(SignalType::OUTPUT_AVAILABLE);
         return res;
     }
 
@@ -534,6 +535,8 @@ struct ProcessData
 class ProcessWrapperTransform : public WrapperTransform
 {
     Q_OBJECT
+    Q_PROPERTY(int concurrentCount READ get_concurrentCount WRITE set_concurrentCount RESET reset_concurrentCount STORED false)
+    BR_PROPERTY(int, concurrentCount, 2)
 
     QString baseKey;
 
@@ -579,17 +582,33 @@ class ProcessWrapperTransform : public WrapperTransform
         if (transform) {
             QDataStream out(&serialized, QFile::WriteOnly);
             transform->serialize(out);
+            tcount = Globals->parallelism;
+            counter.acquire(counter.available());
+            counter.release(this->concurrentCount);
         }
     }
 
-    QByteArray serialized;
+    static QSemaphore counter;
+    mutable int tcount;
+    mutable QByteArray serialized;
     void transmitTForm(CommunicationManager *localComm) const
     {
         if (serialized.isEmpty() )
             qFatal("Trying to transmit empty transform!");
 
+        counter.acquire(1);
+        static QMutex transmission;
+        QMutexLocker lock(&transmission);
+        tcount--;
+
         localComm->writeArray = serialized;
+        if (tcount == 0)
+            serialized.clear();
+        lock.unlock();
+
         emit localComm->pulseSendSerialized();
+        localComm->getSignal();
+        counter.release(1);
     }
 
     void activateProcess(ProcessData *data) const
@@ -633,6 +652,7 @@ public:
     bool processActive;
     ProcessWrapperTransform() : WrapperTransform(false) { processActive = false; }
 };
+QSemaphore ProcessWrapperTransform::counter;
 
 BR_REGISTER(Transform, ProcessWrapperTransform)