diff --git a/libs/client_server/piclientserver_server.cpp b/libs/client_server/piclientserver_server.cpp
index f1700b01..edfd2083 100644
--- a/libs/client_server/piclientserver_server.cpp
+++ b/libs/client_server/piclientserver_server.cpp
@@ -72,11 +72,7 @@ PIClientServer::Server::~Server() {
 	clean_thread->waitForFinish();
 	piDeleteSafety(clean_thread);
 	stopServer();
-	for (auto c: clients) {
-		c->aboutDelete();
-		c->destroy();
-		delete c;
-	}
+	closeAll();
 	piDeleteSafety(tcp_server);
 }
 
diff --git a/libs/main/io_devices/piethernet.cpp b/libs/main/io_devices/piethernet.cpp
index 19eddf28..7cb7a1dc 100644
--- a/libs/main/io_devices/piethernet.cpp
+++ b/libs/main/io_devices/piethernet.cpp
@@ -527,6 +527,7 @@ bool PIEthernet::listen(bool threaded) {
 		listen_threaded = true;
 		server_bounded  = false;
 		server_thread_.start(server_func);
+		server_thread_.waitForStart();
 		return true;
 	}
 	listen_threaded = server_bounded = false;
diff --git a/libs/main/types/pisystemtime.cpp b/libs/main/types/pisystemtime.cpp
index 4d218968..f26b7bd6 100644
--- a/libs/main/types/pisystemtime.cpp
+++ b/libs/main/types/pisystemtime.cpp
@@ -105,7 +105,7 @@ extern clock_serv_t __pi_mac_clock;
 //! Используйте этот метод для ожидания разниц системных времен или своего времени.
 //! Если метод будет вызван для системного времени \a PISystemTime::current(), то
 //! ожидание будет почти бесконечным
-void PISystemTime::sleep() {
+void PISystemTime::sleep() const {
 	piUSleep(piFloord(toMicroseconds()));
 }
 
@@ -118,7 +118,7 @@ void PISystemTime::toTimespec(void * ts) {
 }
 
 
-PISystemTime::Frequency PISystemTime::toFrequency() {
+PISystemTime::Frequency PISystemTime::toFrequency() const {
 	return PISystemTime::Frequency::fromSystemTime(*this);
 }
 
diff --git a/libs/main/types/pisystemtime.h b/libs/main/types/pisystemtime.h
index bb197377..c7438c7e 100644
--- a/libs/main/types/pisystemtime.h
+++ b/libs/main/types/pisystemtime.h
@@ -253,7 +253,7 @@ public:
 
 	//! \~english Sleep for this time
 	//! \~russian Ожидать это время
-	void sleep();
+	void sleep() const;
 
 	//! \~english On *nix system assign current value to timespec struct
 	//! \~russian На *nix системах присваивает время к timespec структуре
@@ -261,7 +261,7 @@ public:
 
 	//! \~english Returns \a Frequency that corresponds this time interval
 	//! \~russian Возвращает \a Frequency соответствующую этому временному интервалу
-	PISystemTime::Frequency toFrequency();
+	PISystemTime::Frequency toFrequency() const;
 
 	//! \~english Returns "yyyy-MM-dd hh:mm:ss.zzz" for absolute time and "<V> <d|h|m|s|ms|us|ns> ..." for relative
 	//! \~russian Возвращает "yyyy-MM-dd hh:mm:ss.zzz" для абсолютного времени и "<V> <d|h|m|s|ms|us|ns> ..." для относительного
diff --git a/tests/client_server/client_server_test.cpp b/tests/client_server/client_server_test.cpp
index bbe639c5..e0980649 100644
--- a/tests/client_server/client_server_test.cpp
+++ b/tests/client_server/client_server_test.cpp
@@ -32,6 +32,7 @@ Client * createAndConnectClient() {
 TEST(ClientServer, OneClient) {
 	auto const loop_timeout = 1000_ms;
 	auto s                  = createServer<false, true>();
+	piMinSleep();
 	auto c                  = createAndConnectClient<TestClient<false, false>>();
 
 	waitLoop([s]() { return s->clientsCount() > 0; }, loop_timeout);
@@ -106,6 +107,7 @@ TEST(ClientServer, ManyClients) {
 	constexpr int clients_count = 20;
 	PIVector<ClientSendThread *> clients;
 	auto s = createServer<false, false, 100_KiB>();
+	piMinSleep();
 
 	piForTimes(clients_count) {
 		clients.append(new ClientSendThread());
@@ -137,7 +139,7 @@ TEST(ClientServer, ManyClients) {
 	for (const auto c: clients) {
 		c->startSend();
 	}
-	(100_ms).sleep();
+	loop_timeout.sleep();
 	EXPECT_TRUE(getClientsPings(clients) > clients_count * 2);
 	EXPECT_TRUE(getServerPongs(s) > clients_count * 2);
 	piDeleteAllAndClear(clients);
@@ -147,7 +149,7 @@ TEST(ClientServer, ManyClients) {
 }
 
 TEST(ClientServer, DynamicClients) {
-	auto const loop_timeout     = 100_ms;
+	auto const loop_timeout     = 10_ms;
 	constexpr int clients_count = 20;
 	PIVector<ClientSendThread *> clients;
 	PIMutex clients_mutex;
@@ -160,7 +162,6 @@ TEST(ClientServer, DynamicClients) {
 		clients_mutex.lock();
 		clients << c;
 		clients_mutex.unlock();
-		piCout << "new client" << clients.size();
 	};
 
 	piForTimes(clients_count) {
@@ -178,9 +179,8 @@ TEST(ClientServer, DynamicClients) {
 			piForTimes(new_cnt) {
 				spawnClient();
 			}
-			piCout << "+++++++";
 		},
-		12_Hz);
+		120_Hz);
 
 	deleteThread.start(
 		[&clients, &clients_mutex]() {
@@ -194,28 +194,20 @@ TEST(ClientServer, DynamicClients) {
 				clients_mutex.unlock();
 				if (c) {
 					delete c;
-					piCout << "remove client" << clients.size();
 				}
 			}
-			piCout << "----------";
 		},
-		13_Hz);
+		130_Hz);
 
-	(2_s).sleep();
+	(loop_timeout * clients_count).sleep();
 
 	EXPECT_GE(s->clientsCount(), 10);
 
-	piCout << "now clients" << clients.size();
-
-
 	deleteThread.stopAndWait();
 	spawnThread.stopAndWait();
 
-
-	piCout << "total clients" << clients.size();
-
 	piDeleteAllAndClear(clients);
-	waitLoop([s]() { return s->clientsCount() == 0; }, loop_timeout);
+	waitLoop([s]() { return s->clientsCount() == 0; }, loop_timeout * clients_count);
 	EXPECT_EQ(0, s->clientsCount());
 
 	delete s;