diff --git a/config-example.json b/config-example.json
--- a/config-example.json
+++ b/config-example.json
@@ -1,5 +1,8 @@
 {
 	"hosts": ["127.0.0.1"],
 	"port": 9901,
-	"batchSize": 64
+	"batchSize": {
+		"hash": 256,
+		"data": 64
+	}
 }
diff --git a/src/client.py b/src/client.py
--- a/src/client.py
+++ b/src/client.py
@@ -74,7 +74,7 @@ class Client(NetNode):
 		progress=Progress(localTree.leafCount)
 		while len(nodeStack)>0:
 			indices=[]
-			for i in range(conf.batchSize):
+			for i in range(conf.batchSize.hash):
 				indices.append(nodeStack.pop())
 				if len(nodeStack)==0: break
 			self._outcoming.writeMsg({"command":"req", "index":indices, "dataType":"hash"})
@@ -111,10 +111,10 @@ class Client(NetNode):
 		print(datetime.now(), "sending data:")
 		progress=Progress(len(blocksToTransfer))
 
-		for k in range(0,len(blocksToTransfer),conf.batchSize):
+		for k in range(0,len(blocksToTransfer),conf.batchSize.data):
 			indices=[]
 			blocks=[]
-			for j in range(conf.batchSize):
+			for j in range(conf.batchSize.data):
 				if k+j>=len(blocksToTransfer): break
 				i2=blocksToTransfer[k+j]
 				if i1+1!=i2:
@@ -148,8 +148,8 @@ class Client(NetNode):
 		print(datetime.now(), "receiving data:")
 		progress=Progress(len(blocksToTransfer))
 
-		for k in range(0,len(blocksToTransfer),conf.batchSize):
-			indices=blocksToTransfer[k:k+conf.batchSize]
+		for k in range(0,len(blocksToTransfer),conf.batchSize.data):
+			indices=blocksToTransfer[k:k+conf.batchSize.data]
 			self._outcoming.writeMsg({"command":"req", "index":indices, "dataType":"data"})
 			jsonData,binData=self._incoming.readMsg()
 			assert jsonData["command"]=="send" and jsonData["index"]==indices and jsonData["dataType"]=="data", jsonData
diff --git a/src/config.py b/src/config.py
--- a/src/config.py
+++ b/src/config.py
@@ -27,4 +27,7 @@ lowestCompatible=[0,1,0] # tuple is more
 hosts=conf.get("hosts",["127.0.0.1"])
 port=conf.get("port",9901)
 
-batchSize=conf.get("batchSize",64)
+bSize=conf.get("batchSize",dict())
+class batchSize:
+	hash=bSize.get("hash",256)
+	data=bSize.get("data",64)
diff --git a/src/tests/test_overall.py b/src/tests/test_overall.py
--- a/src/tests/test_overall.py
+++ b/src/tests/test_overall.py
@@ -17,7 +17,8 @@ handler=FileHandler("/tmp/morevna.log")
 handler.setFormatter(config.formatter)
 config.logger.addHandler(handler)
 
-config.batchSize=8
+config.batchSize.hash=8
+config.batchSize.data=8
 
 dataDir=os.path.join(config.directory,"src/tests/data")
 filename=os.path.join(dataDir,"test.img")