diff --git a/tests/performances/ipc_connection.cr b/tests/performances/ipc_connection.cr
index 0056a1e..07d2c1e 100644
--- a/tests/performances/ipc_connection.cr
+++ b/tests/performances/ipc_connection.cr
@@ -5,19 +5,13 @@ 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"
+		c = IPC::Client.new "pong"
+	end
+
+	bm.report("connection through websocket") do
+		tws = TestWS.new ws_uri
 	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_exchange.cr b/tests/performances/ipc_message_exchange.cr
index 6e1f588..9d2cbb9 100644
--- a/tests/performances/ipc_message_exchange.cr
+++ b/tests/performances/ipc_message_exchange.cr
@@ -2,25 +2,44 @@ require "benchmark"
 require "ipc"
 require "../test-ws"
 
-ws_uri = "ws://localhost:1234/pong"
+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"
+pong = IPC::Client.new "pong"
+pong.base_timer = 100_000
+pong.timer      = 100_000
 
 Benchmark.ips do |bm|
 	bm.report("direct: round trip time") do
-		pong.send 42, "coucou"
-		m = pong.read
+		# puts "direct: round trip time"
+		pong.send pong.server_fd.not_nil!, 42, "coucou"
+		::loop do
+			event = pong.wait_event do |event|
+			end
+
+			case event
+			when IPC::Event::MessageSent
+				# OK
+			when IPC::Event::MessageReceived
+				# puts "message received"
+				break
+			else
+				puts "event: #{event}"
+			end
+		end
 	end
 
-	bm.report("web sockets: round trip time") do
-		ws_pong.send 42, "coucou"
-		m = ws_pong.read
-	end
+	#bm.report("web sockets: round trip time") do
+	#	# puts "web sockets: round trip time"
+	#	ws_pong.send 42, "coucou"
+	#	m = ws_pong.read
+	#end
 
 	bm.report("web sockets + json: round trip time") do
+		# puts "web sockets + json: round trip time"
 		ws_pong_json.send 42, "coucou"
 		m = ws_pong_json.read
 	end
diff --git a/tests/test-ws.cr b/tests/test-ws.cr
index f4ccabb..0582b29 100644
--- a/tests/test-ws.cr
+++ b/tests/test-ws.cr
@@ -10,12 +10,12 @@ require "../src/lib_modifications.cr"
 require "json"
 
 class TestIPC
-	property ipcc : IPC::Connection
+	property ipcc : IPC::Client
 	property is_json : Bool
 
 	def initialize(service_name : String)
 		@is_json = uri.ends_with? ".JSON"
-		@ipcc = IPC::Connection.new service_name
+		@ipcc = IPC::Client.new service_name
 	end
 
 	# TODO
@@ -60,9 +60,9 @@ class TestWS
 		m : String | Bytes
 
 		if @is_json
-			m = IPC::Message.new(1.to_u8, type.to_u8, data).to_json
+			m = IPC::Message.new(0, 1.to_u8, type.to_u8, data).to_json
 		else
-			m = IPC::Message.new(1.to_u8, type.to_u8, data).to_packet
+			m = IPC::Message.new(0, 1.to_u8, type.to_u8, data).to_packet
 		end
 	
 		@ws.send m