diff --git a/src/pocketmine/Server.php b/src/pocketmine/Server.php
index 133d83026..a0546d71a 100644
--- a/src/pocketmine/Server.php
+++ b/src/pocketmine/Server.php
@@ -346,6 +346,10 @@ class Server{
 		return $this->getConfigString("motd", "Minecraft: PE Server");
 	}
 
+	public function getServerUniqueId(){
+		return $this->serverID;
+	}
+
 	/**
 	 * @return bool
 	 */
@@ -1638,7 +1642,10 @@ class Server{
 
 		$this->logger->info($this->getLanguage()->translateString("pocketmine.server.networkStart", [$this->getIp() === "" ? "*" : $this->getIp(), $this->getPort()]));
 		define("BOOTUP_RANDOM", @Utils::getRandomBytes(16));
-		$this->serverID = Utils::getServerUniqueId($this->getIp() . $this->getPort());
+		$this->serverID = Utils::getMachineUniqueId($this->getIp() . $this->getPort());
+
+		$this->getLogger()->debug("Server unique id: " . $this->getServerUniqueId());
+		$this->getLogger()->debug("Machine unique id: " . Utils::getMachineUniqueId());
 
 		$this->network = new Network($this);
 		$this->network->setName($this->getMotd());
diff --git a/src/pocketmine/command/defaults/GarbageCollectorCommand.php b/src/pocketmine/command/defaults/GarbageCollectorCommand.php
index ef0ce367c..bbb63ccd6 100644
--- a/src/pocketmine/command/defaults/GarbageCollectorCommand.php
+++ b/src/pocketmine/command/defaults/GarbageCollectorCommand.php
@@ -45,6 +45,8 @@ class GarbageCollectorCommand extends VanillaCommand{
 		$entitiesCollected = 0;
 		$tilesCollected = 0;
 
+		$memory = memory_get_usage();
+
 		foreach($sender->getServer()->getLevels() as $level){
 			$diff = [count($level->getChunks()), count($level->getEntities()), count($level->getTiles())];
 			$level->doChunkGarbageCollection();
@@ -62,6 +64,7 @@ class GarbageCollectorCommand extends VanillaCommand{
 		$sender->sendMessage(TextFormat::GOLD . "Tiles: " . TextFormat::RED . number_format($tilesCollected));
 
 		$sender->sendMessage(TextFormat::GOLD . "Cycles: " . TextFormat::RED . number_format($cyclesCollected));
+		$sender->sendMessage(TextFormat::GOLD . "Memory freed: " . TextFormat::RED . number_format(round((($memory - memory_get_usage()) / 1024) / 1024, 2))." MB");
 		return true;
 	}
 }
diff --git a/src/pocketmine/scheduler/SendUsageTask.php b/src/pocketmine/scheduler/SendUsageTask.php
index 2ec40a6d8..04b75c8d6 100644
--- a/src/pocketmine/scheduler/SendUsageTask.php
+++ b/src/pocketmine/scheduler/SendUsageTask.php
@@ -40,8 +40,9 @@ class SendUsageTask extends AsyncTask{
 		$path = "post";
 
 		$data = [];
-		$data["uniqueServerId"] = Utils::getServerUniqueId();
-		$data["uniqueRequestId"] = Utils::dataToUUID(Utils::getServerUniqueId(), microtime(true));
+		$data["uniqueServerId"] = $server->getServerUniqueId();
+		$data["uniqueMachineId"] = Utils::getMachineUniqueId();
+		$data["uniqueRequestId"] = Utils::dataToUUID($server->getServerUniqueId(), microtime(true));
 
 		switch($type){
 			case self::TYPE_OPEN:
diff --git a/src/pocketmine/utils/Utils.php b/src/pocketmine/utils/Utils.php
index 15fd8bf45..ca05b1676 100644
--- a/src/pocketmine/utils/Utils.php
+++ b/src/pocketmine/utils/Utils.php
@@ -78,13 +78,13 @@ class Utils{
 	 *
 	 * @return string
 	 */
-	public static function getServerUniqueId($extra = ""){
-		if(self::$serverUniqueId !== null){
+	public static function getMachineUniqueId($extra = ""){
+		if(self::$serverUniqueId !== null and $extra === ""){
 			return self::$serverUniqueId;
 		}
 
 		$machine = php_uname("a");
-		$machine .= file_exists("/proc/cpuinfo") ? implode(preg_grep("/model name/", file("/proc/cpuinfo"))) : "";
+		$machine .= file_exists("/proc/cpuinfo") ? implode(preg_grep("/(model name|Processor|Serial)/", file("/proc/cpuinfo"))) : "";
 		$machine .= sys_get_temp_dir();
 		$machine .= $extra;
 		$os = Utils::getOS();
@@ -110,6 +110,11 @@ class Utils{
 				}
 				$machine .= implode(" ", $matches[1]); //Mac Addresses
 			}
+			$machine .= file_exists("/etc/machine-id") ? file_get_contents("/etc/machine-id") : "";
+		}elseif($os === "android"){
+			$machine .= @file_get_contents("/system/build.prop");
+		}elseif($os === "mac"){
+			$machine .= `system_profiler SPHardwareDataType | grep UUID`;
 		}
 		$data = $machine . PHP_MAXPATHLEN;
 		$data .= PHP_INT_MAX;
@@ -119,7 +124,13 @@ class Utils{
 			$data .= $ext . ":" . phpversion($ext);
 		}
 
-		return self::$serverUniqueId = Utils::dataToUUID($machine, $data);
+		$uuid = Utils::dataToUUID($machine, $data);
+
+		if($extra === ""){
+			self::$serverUniqueId = $uuid;
+		}
+
+		return $uuid;
 	}
 
 	/**
@@ -245,8 +256,15 @@ class Utils{
 		return count(ThreadManager::getInstance()->getAll()) + 3; //RakLib + MainLogger + Main Thread
 	}
 
-	public static function getCoreCount(){
-		$processors = 0;
+	public static function getCoreCount($recalculate = false){
+		static $processors = 0;
+
+		if($processors > 0 and !$recalculate){
+			return $processors;
+		}else{
+			$processors = 0;
+		}
+
 		switch(Utils::getOS()){
 			case "linux":
 			case "android":
@@ -256,13 +274,16 @@ class Utils{
 							++$processors;
 						}
 					}
+				}else{
+					if(preg_match("/^([0-9]+)\\-([0-9]+)$/", trim(@file_get_contents("/sys/devices/system/cpu/present")), $matches) > 0){
+						$processors = (int) ($matches[2] - $matches[1]);
+					}
 				}
 				break;
 			case "bsd":
-				$processors = (int) `sysctl hw.ncpu | awk '{ print $2+1 }'`;
-				break;
 			case "mac":
-				$processors = (int) `sysctl hw.availcpu | awk '{ print $2+1 }'`;
+				$processors = (int) `sysctl -n hw.ncpu`;
+				$processors = (int) `sysctl -n hw.ncpu`;
 				break;
 			case "win":
 				$processors = (int) getenv("NUMBER_OF_PROCESSORS");