diff --git a/shard.yml b/shard.yml
index b5a26ef..4639ec1 100644
--- a/shard.yml
+++ b/shard.yml
@@ -1,5 +1,5 @@
 name: ipcd
-version: 0.2.0
+version: 0.3.0
 
 authors:
     - karchnu <karchnu@karchnu.fr>
@@ -40,4 +40,18 @@ targets:
     test-closing:
         main: tests/closing.cr
 
+    # performance tests
+    test-perf-messages:
+        main: tests/performances/ipc_message.cr
+
+    test-perf-connection:
+        main: tests/performances/ipc_connection.cr
+
+    test-perf-message-exchange:
+        main: tests/performances/ipc_message_exchange.cr
+
+    test-perf-puts:
+        main: tests/performances/puts.cr
+
+
 license: ISC
diff --git a/src/ws.cr b/src/lib_modifications.cr
similarity index 89%
rename from src/ws.cr
rename to src/lib_modifications.cr
index d75b211..cf3c8f6 100644
--- a/src/ws.cr
+++ b/src/lib_modifications.cr
@@ -1,3 +1,4 @@
+# Libraries modifications
 
 require "http"
 require "http/web_socket/protocol"
@@ -95,6 +96,7 @@ class HTTP::WebSocket
     return NotFinal.new
   end
 
+  # Returns the websocket instance.
   def ws
     @ws
   end
@@ -111,7 +113,15 @@ class WebSocket < HTTP::WebSocket
   getter? closed = false
 
   def finalize
-	  # puts "WrappedTCPFileDescriptor garbage collection!!"
-	  # super
+    # puts "WrappedTCPFileDescriptor garbage collection!!"
+    # super
+  end
+end
+
+class WrappedTCPFileDescriptor < TCPSocket
+  # do not close the connection when garbage collected!!
+  def finalize
+    # puts "WrappedTCPFileDescriptor garbage collection!!"
+    # super
   end
 end
diff --git a/src/pongd.cr b/src/pongd.cr
index 74a8cdc..e60b1a7 100644
--- a/src/pongd.cr
+++ b/src/pongd.cr
@@ -42,7 +42,7 @@ service.loop do |event|
 				puts "#{CGREEN}IPC::Event::Message#{CRESET}, client: #{event.connection.fd}"
 				if verbosity >= 2
 					m = String.new event.message.payload
-					puts "#{CBLUE}message type #{event.message.type}: #{m} #{CRESET}"
+					puts "#{CBLUE}message type #{event.message.utype}: #{m} #{CRESET}"
 				end
 			end
 			event.connection.send event.message
diff --git a/src/utils.cr b/src/utils.cr
index 43980bb..1c0153d 100644
--- a/src/utils.cr
+++ b/src/utils.cr
@@ -1,19 +1,5 @@
 require "io/hexdump"
 
-def to_message (user_type : Int, message : String)
-	payload = Bytes.new (6 + message.to_slice.size)
-
-	# true start
-	payload[0] = 1.to_u8
-	IO::ByteFormat::NetworkEndian.encode message.to_slice.size, (payload + 1)
-
-	# second part: user message
-	payload[5] = user_type.to_u8
-	(payload + 6).copy_from message.to_slice
-
-	return payload
-end
-
 def print_hexa(message : String, aroundmsg : String)
 	puts "#{aroundmsg} [["
 	m = IO::Memory.new(message)
diff --git a/src/websocketd.cr b/src/websocketd.cr
index 3dac0f7..d76e209 100644
--- a/src/websocketd.cr
+++ b/src/websocketd.cr
@@ -2,7 +2,6 @@ require "option_parser"
 require "ipc"
 require "socket"
 require "./colors"
-require "./ws"
 
 require "json"
 
@@ -12,39 +11,23 @@ require "base64"
 require "digest"
 require "./utils"
 
-class IPC::Connection
-	def initialize(fd : Int32)
-		external_connection = LibIPC::Connection.new
-		external_connection.fd = fd
-		initialize(external_connection)
-	end
-end
-
-class IPC::Message
-	def to_buffer
-		to_message @type, String.new(@payload)
-	end
-end
-
-
-class WrappedTCPFileDescriptor < TCPSocket
-	# do not close the connection when garbage collected!!
-	def finalize
-		# puts "WrappedTCPFileDescriptor garbage collection!!"
-		# super
-	end
-end
+# All modifications to standard libraries go there.
+require "./lib_modifications.cr"
 
+# service instance parameters
+# they can be changed via the cli
 service_name = "websocket"
 host = "0.0.0.0"
 port_to_listen = 1234
 timer_delay = 30.to_i64
 
+verbosity = 1
+
 OptionParser.parse do |parser|
 	parser.on "-l host", "--l host", "IP address to listen on." do |h|
 		host = h
 	end
-	
+
 	parser.on "-p port", "--port port", "Port to listen on." do |port|
 		port_to_listen = port.to_u16
 	end
@@ -57,12 +40,18 @@ OptionParser.parse do |parser|
 		timer_delay = t.to_i64
 	end
 
+	parser.on "-v verbosity-level", "--verbosity level", "Verbosity." do |opt|
+		verbosity = opt.to_i
+	end
+
 	parser.on "-h", "--help", "Show this help" do
 		puts parser
 		exit 0
 	end
 end
 
+
+# Link between fd and TCPSocket, WebSocket and IPC::Connection instances.
 class InstanceStorage
 	property service : IPC::SwitchingService
 	property switchtable : Hash(Int32, Int32)
@@ -83,6 +72,7 @@ class InstanceStorage
 	end
 
 	def remove_fd (fdclient : Int32)
+		puts "#{CBLUE}closing the client:#{CRESET} #{fdclient}"
 		# 1. closing both the client and the service
 		fdservice = @switchtable[fdclient]?
 		tcpfdc = @fd_to_tcpsocket[fdclient]
@@ -199,7 +189,6 @@ end
 
 
 def closing_client (fdclient : Int, context : InstanceStorage)
-	puts "#{CBLUE}closing the client:#{CRESET} #{fdclient}"
 	context.remove_fd fdclient
 end
 
@@ -230,23 +219,7 @@ def websocket_connection_procedure (requested_service : String, clientfd : Int32
 		context.is_client[newservice.fd] = false
 	rescue e
 		puts "#{CRED}Exception during connection to the service:#{CRESET} #{e}"
-		closing_client clientfd, context
-	end
-end
-
-class JSONWSMessage
-	JSON.mapping(
-		mtype: Int32,
-		payload: String
-	)
-
-	def initialize (@mtype : Int32, @payload : String)
-	end
-end
-
-class IPC::Message
-	def to_json
-		JSONWSMessage.new(@type.to_i, String.new(@payload)).to_json
+		context.remove_fd clientfd
 	end
 end
 
@@ -261,28 +234,29 @@ def websocket_switching_procedure (activefd : Int, context : InstanceStorage)
 					message = wsclient.run_once
 				rescue e
 					puts "#{CRED}Exception (receiving a message)#{CRESET} #{e}"
-					closing_client activefd, context
+					context.remove_fd activefd
 					return
 				end
 
+				# Checking the internals of WebSocket, then the contained IO within, to know if there is still something to read in the socket.
 				still_something_to_read = ! wsclient.ws.io.empty?
 
 				if wsclient.closed?
 					# puts "#{CBLUE}client is closed#{CRESET}"
-					closing_client client.fd, context
+					context.remove_fd client.fd
 					return
 				end
 
 				if message.nil?
 					puts "#{CRED}message is nil#{CRESET}"
-					closing_client client.fd, context
+					context.remove_fd client.fd
 					return
 				end
 
 				case message
 				when WebSocket::Error
 					puts "#{CRED}An error occured#{CRESET}"
-					closing_client client.fd, context
+					context.remove_fd client.fd
 					return
 				when WebSocket::Ping
 					# puts "#{CBLUE}Received a ping message#{CRESET}"
@@ -294,7 +268,7 @@ def websocket_switching_procedure (activefd : Int, context : InstanceStorage)
 					break
 				when WebSocket::Close
 					# puts "#{CBLUE}Received a close message#{CRESET}"
-					closing_client client.fd, context
+					context.remove_fd client.fd
 					return
 				when WebSocket::NotFinal
 					# puts "#{CBLUE}Received only part of a message#{CRESET}"
@@ -307,14 +281,15 @@ def websocket_switching_procedure (activefd : Int, context : InstanceStorage)
 				end
 
 				if context.is_json[activefd] && message.is_a?(String)
-					jsonmessage = JSONWSMessage.from_json message
-					message = to_message jsonmessage.mtype, jsonmessage.payload
+					message = IPC::Message.from_json(message).to_packet
 				end
 
 				# client => service
 				fdservice = context.switchtable[activefd]
 
 				# XXX: this is not a TCP fd, but since behind the scene this is compatible, I'm hacking a bit
+				# Also, I changed the "finalize" method of the TCPFileDescriptor class not to close the socket
+				# when the object is GC.
 				serv = WrappedTCPFileDescriptor.new(fd: fdservice, family: Socket::Family::INET)
 				#serv = context.fd_to_ipcconnection[fdservice]
 				serv.send message
@@ -333,7 +308,7 @@ def websocket_switching_procedure (activefd : Int, context : InstanceStorage)
 			if context.is_json[fdclient]
 				buf = message.to_json
 			else
-				buf = message.to_buffer
+				buf = message.to_packet
 			end
 
 			wsclient.send buf
@@ -371,21 +346,29 @@ service.base_timer = timer_delay
 service.loop do |event|
 	case event
 	when IPC::Event::Timer
-		puts "#{CORANGE}IPC::Event::Timer#{CRESET}"
+		if verbosity > 0
+			puts "#{CORANGE}IPC::Event::Timer#{CRESET}"
+		end
 		sending_ping_messages context
 	when IPC::Event::Connection
-		puts "#{CBLUE}IPC::Event::Connection#{CRESET}: #{event.connection.fd}"
+		if verbosity > 0
+			puts "#{CBLUE}IPC::Event::Connection#{CRESET}: #{event.connection.fd}"
+		end
 	when IPC::Event::Disconnection
-		puts "#{CBLUE}IPC::Event::Disconnection#{CRESET}: #{event.connection.fd}"
+		if verbosity > 0
+			puts "#{CBLUE}IPC::Event::Disconnection#{CRESET}: #{event.connection.fd}"
+		end
 	when IPC::Event::ExtraSocket
-		puts "#{CBLUE}IPC::Event::ExtraSocket#{CRESET}: #{event.connection.fd}"
+		if verbosity > 0
+			puts "#{CBLUE}IPC::Event::ExtraSocket#{CRESET}: #{event.connection.fd}"
+		end
 
 		# 1. accept new websocket clients
 		if server.fd == event.connection.fd
 			client = server.accept
 			begin
 				websocket_client_connection client, context
-				puts "#{CBLUE}new client:#{CRESET} #{client.fd}"
+				puts "#{CBLUE}new client:#{CRESET} #{client.fd}" unless verbosity == 0
 			rescue e
 				puts "Exception: #{CRED}#{e}#{CRESET}"
 				client.close
@@ -398,14 +381,18 @@ service.loop do |event|
 		websocket_switching_procedure activefd, context
 
 	when IPC::Event::Switch
-		puts "\033[36mIPC::Event::Switch#{CRESET}: from fd #{event.connection.fd}"
+		if verbosity > 0
+			puts "\033[36mIPC::Event::Switch#{CRESET}: from fd #{event.connection.fd}"
+		end
 
 		raise "Not implemented."
 
 	# IPC::Event::Message has to be the last entry
 	# because ExtraSocket and Switch inherit from Message class
 	when IPC::Event::Message
-		puts "#{CBLUE}IPC::Event::Message#{CRESET}: #{event.connection.fd}"
+		if verbosity > 0
+			puts "#{CBLUE}IPC::Event::Message#{CRESET}: #{event.connection.fd}"
+		end
 
 		raise "Not implemented."
 	end
diff --git a/tests/performances/ipc_connection.cr b/tests/performances/ipc_connection.cr
new file mode 100644
index 0000000..0056a1e
--- /dev/null
+++ b/tests/performances/ipc_connection.cr
@@ -0,0 +1,23 @@
+require "benchmark"
+require "ipc"
+require "../test-ws"
+
+ws_uri = "ws://localhost:1234/pong.JSON"
+
+message = IPC::Message.from_json(%({ "mtype" : 3, "utype" : 30, "payload" : "coucou" }))
+pong = IPC::Connection.new "pong"
+
+Benchmark.ips do |bm|
+	bm.report("connection") do
+		c = IPC::Connection.new "pong"
+	end
+end
+
+#puts "sleeping 5 seconds"
+#sleep 5
+#
+#Benchmark.ips do |bm|
+#	bm.report("connection through websocket") do
+#		tws = TestWS.new ws_uri
+#	end
+#end
diff --git a/tests/performances/ipc_message.cr b/tests/performances/ipc_message.cr
new file mode 100644
index 0000000..0bced7d
--- /dev/null
+++ b/tests/performances/ipc_message.cr
@@ -0,0 +1,20 @@
+require "benchmark"
+require "ipc"
+
+message = IPC::Message.from_json(%({ "mtype" : 3, "utype" : 30, "payload" : "coucou" }))
+
+str_message = %({ "mtype" : 3, "utype" : 30, "payload" : "coucou" })
+
+Benchmark.ips do |bm|
+	bm.report("from json") do
+		m = IPC::Message.from_json str_message
+	end
+
+	bm.report("to json") do
+		message.to_json
+	end
+
+	bm.report("to_packet") do
+		message.to_packet
+	end
+end
diff --git a/tests/performances/ipc_message_exchange.cr b/tests/performances/ipc_message_exchange.cr
new file mode 100644
index 0000000..6e1f588
--- /dev/null
+++ b/tests/performances/ipc_message_exchange.cr
@@ -0,0 +1,27 @@
+require "benchmark"
+require "ipc"
+require "../test-ws"
+
+ws_uri = "ws://localhost:1234/pong"
+ws_uri_json = "ws://localhost:1234/pong.JSON"
+ws_pong      = TestWS.new ws_uri
+ws_pong_json = TestWS.new ws_uri_json
+
+pong = IPC::Connection.new "pong"
+
+Benchmark.ips do |bm|
+	bm.report("direct: round trip time") do
+		pong.send 42, "coucou"
+		m = pong.read
+	end
+
+	bm.report("web sockets: round trip time") do
+		ws_pong.send 42, "coucou"
+		m = ws_pong.read
+	end
+
+	bm.report("web sockets + json: round trip time") do
+		ws_pong_json.send 42, "coucou"
+		m = ws_pong_json.read
+	end
+end
diff --git a/tests/performances/puts.cr b/tests/performances/puts.cr
new file mode 100644
index 0000000..d3c4669
--- /dev/null
+++ b/tests/performances/puts.cr
@@ -0,0 +1,18 @@
+require "benchmark"
+require "ipc"
+
+message = IPC::Message.from_json(%({ "mtype" : 3, "utype" : 30, "payload" : "coucou" }))
+
+Benchmark.ips do |bm|
+	bm.report("puts") do
+		puts "coucou"
+	end
+
+	bm.report("puts vide") do
+		puts
+	end
+
+	bm.report("pp! message") do
+		pp! message
+	end
+end
diff --git a/tests/performances/simple-stuff.cr b/tests/performances/simple-stuff.cr
new file mode 100644
index 0000000..419fdef
--- /dev/null
+++ b/tests/performances/simple-stuff.cr
@@ -0,0 +1,28 @@
+require "benchmark"
+
+hash_i = Hash(Int32, Int32).new
+hash_str = Hash(String, String).new
+
+full_hash = Hash(Int32, String).new
+
+1000.times do |i|
+	full_hash[i] = "blah #{i}"
+end
+
+Benchmark.ips do |bm|
+	bm.report("hash[i32] = i32") do
+		hash_i[1] = 3
+	end
+
+	bm.report("hash[String] = String") do
+		hash_str["coucou"] = "truc"
+	end
+
+	bm.report("hash[500]") do
+		blah = full_hash[500]
+	end
+
+	bm.report("hash[800]") do
+		blah = full_hash[800]
+	end
+end
diff --git a/tests/test-ws.cr b/tests/test-ws.cr
index 41240b6..f4ccabb 100644
--- a/tests/test-ws.cr
+++ b/tests/test-ws.cr
@@ -3,10 +3,28 @@ require "http/web_socket"
 require "../src/colors"
 require "../src/utils"
 
-require "../src/ws"
+require "ipc"
+
+require "../src/lib_modifications.cr"
 
 require "json"
 
+class TestIPC
+	property ipcc : IPC::Connection
+	property is_json : Bool
+
+	def initialize(service_name : String)
+		@is_json = uri.ends_with? ".JSON"
+		@ipcc = IPC::Connection.new service_name
+	end
+
+	# TODO
+	#def run
+	#	yield @ipcc
+	#	ipcc.close
+	#end
+end
+
 class TestWS
 	property ws : WebSocket
 	property is_json : Bool
@@ -20,32 +38,31 @@ class TestWS
 	end
 
 	def read
-		m = @ws.read
-		if m.nil?
-			raise "empty message"
-		end
-
-		# remove ping messages, they are not application-relevent
-		while m.is_a?(HTTP::WebSocket::Ping)
-			puts "received a ping message, skipping"
-			m = @ws.read
+		m = nil
+		loop do
+			m = @ws.run_once
 			if m.nil?
 				raise "empty message"
 			end
+
+			# remove ping messages, they are not application-relevent
+			unless m.is_a?(HTTP::WebSocket::Ping)
+				break
+			end
+			puts "received a ping message, skipping"
 		end
 
 		m
 	end
 
-	def send(type : Int32, data : String | Slice)
-		m = to_message type, data
+	def send(type : Int32, data : String)
+
+		m : String | Bytes
 
-		# quick hack to send json messages
 		if @is_json
-			json_message = data.chomp
-			final_json_message = "{ \"mtype\": #{type}, \"payload\": \"#{json_message}\" }"
-			# puts "message: #{final_json_message}"
-			m = final_json_message
+			m = IPC::Message.new(1.to_u8, type.to_u8, data).to_json
+		else
+			m = IPC::Message.new(1.to_u8, type.to_u8, data).to_packet
 		end
 	
 		@ws.send m