diff --git a/core/joblib/SubprocessGenerator.py b/core/joblib/SubprocessGenerator.py
index 82ccbdb..84a5937 100644
--- a/core/joblib/SubprocessGenerator.py
+++ b/core/joblib/SubprocessGenerator.py
@@ -1,7 +1,28 @@
-import queue as Queue
 import multiprocessing
+import queue as Queue
+import threading
+import time
+
 
 class SubprocessGenerator(object):
+    
+    @staticmethod
+    def launch_thread(generator): 
+        generator._start()
+        
+    @staticmethod
+    def start_in_parallel( generator_list ):
+        """
+        Start list of generators in parallel
+        """
+        for generator in generator_list:
+            thread = threading.Thread(target=SubprocessGenerator.launch_thread, args=(generator,) )
+            thread.daemon = True
+            thread.start()
+
+        while not all ([generator._is_started() for generator in generator_list]):
+            time.sleep(0.005)
+    
     def __init__(self, generator_func, user_param=None, prefetch=2, start_now=True):
         super().__init__()
         self.prefetch = prefetch
@@ -17,10 +38,14 @@ class SubprocessGenerator(object):
         if self.p == None:
             user_param = self.user_param
             self.user_param = None
-            self.p = multiprocessing.Process(target=self.process_func, args=(user_param,) )
-            self.p.daemon = True
-            self.p.start()
-
+            p = multiprocessing.Process(target=self.process_func, args=(user_param,) )
+            p.daemon = True
+            p.start()
+            self.p = p
+            
+    def _is_started(self):
+        return self.p is not None
+        
     def process_func(self, user_param):
         self.generator_func = self.generator_func(user_param)
         while True:
diff --git a/samplelib/SampleGeneratorFace.py b/samplelib/SampleGeneratorFace.py
index 696a4f2..a7e622f 100644
--- a/samplelib/SampleGeneratorFace.py
+++ b/samplelib/SampleGeneratorFace.py
@@ -60,7 +60,10 @@ class SampleGeneratorFace(SampleGeneratorBase):
         if self.debug:
             self.generators = [ThisThreadGenerator ( self.batch_func, (pickled_samples, index_host.create_cli(), ct_pickled_samples, ct_index_host.create_cli() if ct_index_host is not None else None) )]
         else:
-            self.generators = [SubprocessGenerator ( self.batch_func, (pickled_samples, index_host.create_cli(), ct_pickled_samples, ct_index_host.create_cli() if ct_index_host is not None else None), start_now=True ) for i in range(self.generators_count) ]
+            self.generators = [SubprocessGenerator ( self.batch_func, (pickled_samples, index_host.create_cli(), ct_pickled_samples, ct_index_host.create_cli() if ct_index_host is not None else None), start_now=False ) \
+                               for i in range(self.generators_count) ]
+                               
+            SubprocessGenerator.start_in_parallel( self.generators )
 
         self.generator_counter = -1
 
diff --git a/samplelib/SampleGeneratorFacePerson.py b/samplelib/SampleGeneratorFacePerson.py
index d6be2d8..ba69f44 100644
--- a/samplelib/SampleGeneratorFacePerson.py
+++ b/samplelib/SampleGeneratorFacePerson.py
@@ -52,7 +52,7 @@ class SampleGeneratorFacePerson(SampleGeneratorBase):
             self.generators = [iter_utils.ThisThreadGenerator ( self.batch_func, (samples_host.create_cli(), index2d_host.create_cli(),) )]
         else:
             self.generators_count = np.clip(multiprocessing.cpu_count(), 2, 4)
-            self.generators = [iter_utils.SubprocessGenerator ( self.batch_func, (samples_host.create_cli(), index2d_host.create_cli(),), start_now=True ) for i in range(self.generators_count) ]
+            self.generators = [iter_utils.SubprocessGenerator ( self.batch_func, (samples_host.create_cli(), index2d_host.create_cli(),) ) for i in range(self.generators_count) ]
 
         self.generator_counter = -1
 
diff --git a/samplelib/SampleGeneratorFaceTemporal.py b/samplelib/SampleGeneratorFaceTemporal.py
index 7a9215f..5ffb8e4 100644
--- a/samplelib/SampleGeneratorFaceTemporal.py
+++ b/samplelib/SampleGeneratorFaceTemporal.py
@@ -44,7 +44,7 @@ class SampleGeneratorFaceTemporal(SampleGeneratorBase):
         if self.debug:
             self.generators = [ThisThreadGenerator ( self.batch_func, (pickled_samples, index_host.create_cli(),) )]
         else:
-            self.generators = [SubprocessGenerator ( self.batch_func, (pickled_samples, index_host.create_cli(),), start_now=True ) for i in range(self.generators_count) ]
+            self.generators = [SubprocessGenerator ( self.batch_func, (pickled_samples, index_host.create_cli(),) ) for i in range(self.generators_count) ]
 
         self.generator_counter = -1