diff --git a/libs/main/containers/pimap.h b/libs/main/containers/pimap.h
index 7cb8fa68..b50f6684 100644
--- a/libs/main/containers/pimap.h
+++ b/libs/main/containers/pimap.h
@@ -319,16 +319,24 @@ public:
 	inline T & operator[](const Key & key) {
 		bool f(false);
 		const ssize_t i = _find(key, f);
-		if (f) return pim_content[pim_index[i].index];
+		if (f) return _value(i);
 		pim_content.push_back(T());
 		pim_index.insert(i, MapIndex(key, pim_content.size() - 1));
 		return pim_content.back();
 	}
 
-	//! \~english Same as \a value().
-	//! \~russian Синоним \a value().
+	//! \~english Read only access to element by `key`.
+	//! \~russian Доступ исключительно на чтение к элементу по ключу `key`.
+	//! \~\note
+	//! \~english Element with key `key` must exists, otherwise will be undefined behavior.
+	//! \~russian  Элемент по ключу `key` должен существовать,
+	//! иначе это приведёт к неопределённому поведению программы и ошибкам памяти.
 	//! \~\sa \a operator[](), \a value(), \a key()
-	inline T at(const Key & key) const { return value(key); }
+	inline const T & at(const Key & key) const {
+		bool f(false);
+		const ssize_t i = _find(key, f);
+		return _value(i);
+	}
 
 	//! \~english Remove element with key `key` from the array and return it.
 	//! \~russian Удаляет элемент с ключом `key` из массива и возвращает его.
@@ -336,7 +344,7 @@ public:
 		bool f(false);
 		const ssize_t i = _find(key, f);
 		if (!f) return default_;
-		T ret(pim_content[pim_index[i].index]);
+		const T ret = _value(i);
 		_remove(i);
 		return ret;
 	}
@@ -410,7 +418,8 @@ public:
 	//! заданному в передаваемой функции `test`.
 	inline PIMap<Key, T> & removeWhere(std::function<bool(const Key & key, const T & value)> test) {
 		for (int i = 0; i < pim_index.size_s(); ++i) {
-			if (test(pim_index[i].key, pim_content[pim_index[i].index])) {
+			const auto & mi(pim_index[i]);
+			if (test(mi.key, pim_content[mi.index])) {
 				_remove(i);
 				--i;
 			}
@@ -454,7 +463,7 @@ public:
 		bool f(false);
 		const ssize_t i = _find(key, f);
 		if (f) {
-			pim_content[pim_index[i].index] = value;
+			_value(i) = value;
 		} else {
 			pim_content.push_back(value);
 			pim_index.insert(i, MapIndex(key, pim_content.size() - 1));
@@ -466,7 +475,7 @@ public:
 		bool f(false);
 		const ssize_t i = _find(key, f);
 		if (f) {
-			pim_content[pim_index[i].index] = std::move(value);
+			_value(i) = std::move(value);
 		} else {
 			pim_content.push_back(std::move(value));
 			pim_index.insert(i, MapIndex(key, pim_content.size() - 1));
@@ -483,7 +492,7 @@ public:
 		bool f(false);
 		const ssize_t i = _find(pair.first, f);
 		if (f) {
-			pim_content[pim_index[i].index] = pair.second;
+			_value(i) = pair.second;
 		} else {
 			pim_content.push_back(pair.second);
 			pim_index.insert(i, MapIndex(pair.first, pim_content.size() - 1));
@@ -496,7 +505,7 @@ public:
 		Key k(std::move(pair.first));
 		const ssize_t i = _find(k, f);
 		if (f) {
-			pim_content[pim_index[i].index] = std::move(pair.second);
+			_value(i) = std::move(pair.second);
 		} else {
 			pim_content.push_back(std::move(pair.second));
 			pim_index.insert(i, MapIndex(k, pim_content.size() - 1));
@@ -512,7 +521,7 @@ public:
 		bool f(false);
 		const ssize_t i = _find(key, f);
 		if (!f) return default_;
-		return pim_content[pim_index[i].index];
+		return _value(i);
 	}
 
 	//! \~english Returns an array of values of all elements
@@ -525,8 +534,9 @@ public:
 	//! совпадает с `value` или `default_` если такого элемента нет.
 	inline Key key(const T & value, const Key & default_ = Key()) const {
 		for (int i = 0; i < pim_index.size_s(); ++i) {
-			if (pim_content[pim_index[i].index] == value) {
-				return pim_index[i].key;
+			const auto & mi(pim_index[i]);
+			if (pim_content[mi.index] == value) {
+				return mi.key;
 			}
 		}
 		return default_;
@@ -547,7 +557,8 @@ public:
 	//! \~russian Выполняет функцию `void f(const Key & key, const T & value)` для каждого элемента массива.
 	inline void forEach(std::function<void(const Key & key, const T & value)> f) const {
 		for (int i = 0; i < pim_index.size_s(); ++i) {
-			f(pim_index[i].key, pim_content[pim_index[i].index]);
+			const auto & mi(pim_index[i]);
+			f(mi.key, pim_content[mi.index]);
 		}
 	}
 
@@ -560,7 +571,8 @@ public:
 		PIMap<Key2, T2> ret;
 		ret.reserve(size());
 		for (int i = 0; i < pim_index.size_s(); ++i) {
-			ret.insert(f(pim_index[i].key, pim_content[pim_index[i].index]));
+			const auto & mi(pim_index[i]);
+			ret.insert(f(mi.key, pim_content[mi.index]));
 		}
 		return ret;
 	}
@@ -574,7 +586,8 @@ public:
 		PIVector<ST> ret;
 		ret.reserve(size());
 		for (int i = 0; i < pim_index.size_s(); ++i) {
-			ret << f(pim_index[i].key, pim_content[pim_index[i].index]);
+			const auto & mi(pim_index[i]);
+			ret << f(mi.key, pim_content[mi.index]);
 		}
 		return ret;
 	}
@@ -586,8 +599,10 @@ public:
 	inline PIMap<Key, T> filter(std::function<bool(const Key & key, const T & value)> test) const {
 		PIMap<Key, T> ret;
 		for (int i = 0; i < pim_index.size_s(); ++i) {
-			if (test(pim_index[i].key, pim_content[pim_index[i].index])) {
-				ret.insert(pim_index[i].key, pim_content[pim_index[i].index]);
+			const auto & mi(pim_index[i]);
+			const auto & v(pim_content[mi.index]);
+			if (test(mi.key, v)) {
+				ret.insert(mi.key, v);
 			}
 		}
 		return ret;
@@ -650,7 +665,8 @@ private:
 
 	inline const value_type _pair(ssize_t index) const {
 		if (index < 0 || index >= pim_index.size_s()) return value_type();
-		return value_type(pim_index[index].key, pim_content[pim_index[index].index]);
+		const auto & mi(pim_index[index]);
+		return value_type(mi.key, pim_content[mi.index]);
 	}
 
 	inline Key & _key(ssize_t index) { return pim_index[index].key; }
diff --git a/libs/main/io_devices/pibinarylog.cpp b/libs/main/io_devices/pibinarylog.cpp
index 207c4008..9c9eb13a 100644
--- a/libs/main/io_devices/pibinarylog.cpp
+++ b/libs/main/io_devices/pibinarylog.cpp
@@ -177,8 +177,9 @@ bool PIBinaryLog::threadedRead(const uchar * readed, ssize_t size) {
 	if (!canRead() || isEnd()) return PIIODevice::threadedRead(readed, size);
 	is_thread_ok = false;
 	logmutex.lock();
-	PISystemTime pt, lastrec_timestamp = lastrecord.timestamp;
+	const PISystemTime lastrec_timestamp = lastrecord.timestamp;
 	logmutex.unlock();
+	PISystemTime pt;
 	double delay;
 	switch (play_mode) {
 	case PlayRealTime:
@@ -258,7 +259,7 @@ PIString PIBinaryLog::getLogfilePath(const PIString & log_dir, const PIString &
 			   << "Creating directory" << dir.path();
 		dir.make(true);
 	}
-	PIString npath  = log_dir + PIDir::separator + prefix + PIDateTime::current().toString("yyyy_MM_dd__hh_mm_ss");
+	const PIString npath  = log_dir + PIDir::separator + prefix + PIDateTime::current().toString("yyyy_MM_dd__hh_mm_ss");
 	PIString cnpath = npath + ".binlog";
 	int i           = 1;
 	while (PIFile::isExists(cnpath)) {
@@ -317,7 +318,7 @@ int PIBinaryLog::writeBinLog(int id, const void * data, int size) {
 	}
 	if (is_pause) return 0;
 	logmutex.lock();
-	int res = writeRecord(id, PISystemTime::current() - startlogtime, data, size);
+	const int res = writeRecord(id, PISystemTime::current() - startlogtime, data, size);
 	switch (split_mode) {
 	case SplitSize:
 		if (log_size > split_size) createNewFile();
@@ -341,7 +342,7 @@ int PIBinaryLog::writeBinLog(int id, const void * data, int size) {
 int PIBinaryLog::writeBinLog_raw(int id, const PISystemTime & time, const void * data, int size) {
 	if (size <= 0 || !canWrite()) return -1;
 	logmutex.lock();
-	int res = writeRecord(id, time, data, size);
+	const int res = writeRecord(id, time, data, size);
 	logmutex.unlock();
 	if (res > 0)
 		return size;
@@ -386,7 +387,7 @@ PIByteArray PIBinaryLog::readBinLog(int id, PISystemTime * time, int * readed_id
 
 int PIBinaryLog::readBinLog(int id, void * read_to, int max_size, PISystemTime * time, int * readed_id) {
 	if (max_size <= 0 || read_to == 0) return -1;
-	PIByteArray ba = readBinLog(id, time, readed_id);
+	const PIByteArray ba = readBinLog(id, time, readed_id);
 	if (ba.isEmpty()) return -1;
 	int sz = piMini(max_size, ba.size());
 	memcpy(read_to, ba.data(), sz);
@@ -404,7 +405,7 @@ void PIBinaryLog::setHeader(const PIByteArray & header) {
 }
 
 
-PIByteArray PIBinaryLog::getHeader() {
+PIByteArray PIBinaryLog::getHeader() const {
 	return index.info.user_header;
 }
 
@@ -432,7 +433,7 @@ ssize_t PIBinaryLog::readDevice(void * read_to, ssize_t max_size) {
 		piCoutObj << "Read record error";
 		return -1;
 	}
-	ssize_t sz = piMini(max_size, br.data.size());
+	const ssize_t sz = piMini(max_size, br.data.size());
 	if (sz < br.data.size_s()) piCoutObj << "too small read buffer:" << max_size << ", data size:" << br.data.size();
 	memcpy(read_to, br.data.data(), sz);
 	return sz;
@@ -445,7 +446,7 @@ ssize_t PIBinaryLog::writeDevice(const void * data, ssize_t size) {
 
 
 void PIBinaryLog::restart() {
-	bool th = isThreadedRead();
+	const bool th = isThreadedRead();
 	if (th) stopThreadedRead();
 	if (!canRead()) return;
 	logmutex.unlock();
@@ -464,9 +465,9 @@ void PIBinaryLog::restart() {
 
 bool PIBinaryLog::writeFileHeader() {
 	if (file.write(binlog_sig, PIBINARYLOG_SIGNATURE_SIZE) <= 0) return false;
-	uchar version = PIBINARYLOG_VERSION;
+	const uchar version = PIBINARYLOG_VERSION;
 	if (file.write(&version, 1) <= 0) return false;
-	uint32_t sz = user_header.size();
+	const uint32_t sz = user_header.size();
 	file.write(&sz, 4);
 	file.write(user_header);
 	file.flush();
@@ -578,7 +579,7 @@ int PIBinaryLog::writeRecord(int id, PISystemTime time, const void * data, int s
 		++index.info.records_count;
 		is_indexed = true;
 	}
-	int ret = file.write(logdata.data(), logdata.size());
+	const int ret = file.write(logdata.data(), logdata.size());
 	file.flush();
 	write_count++;
 	log_size = file.size();
@@ -638,7 +639,7 @@ void PIBinaryLog::parseLog(PIFile * f, PIBinaryLog::BinLogInfo * info, PIVector<
 		f->read(&sz, 4);
 		if (sz > 0) {
 			PIByteArray user_hdr = f->read(sz);
-			if (info) info->user_header = user_hdr;
+			if (info) info->user_header.swap(user_hdr);
 		}
 	}
 	PIByteArray ba;
@@ -646,7 +647,7 @@ void PIBinaryLog::parseLog(PIFile * f, PIBinaryLog::BinLogInfo * info, PIVector<
 	br.id           = 0;
 	br.size         = 0;
 	bool first      = true;
-	size_t hdr_size = sizeof(Record) - sizeof(PIByteArray);
+	constexpr size_t hdr_size = sizeof(Record) - sizeof(PIByteArray);
 	ba.resize(hdr_size);
 	while (1) {
 		ba.resize(hdr_size);
@@ -721,7 +722,7 @@ bool PIBinaryLog::cutBinLog(const PIBinaryLog::BinLogInfo & src, const PIString
 			   << "Error, can't open" << src.path;
 		return false;
 	}
-	PIVector<int> ids = src.records.keys();
+	const PIVector<int> ids = src.records.keys();
 	slog.seekTo(from);
 	PIBinaryLog dlog;
 	dlog.createNewFile(dst);
@@ -825,7 +826,7 @@ bool PIBinaryLog::joinBinLogsSerial(const PIStringList & src,
 
 bool PIBinaryLog::createIndex() {
 	logmutex.lock();
-	llong cp = file.pos();
+	const llong cp = file.pos();
 	file.seekToBegin();
 	index.clear();
 	parseLog(&file, &index.info, &index.index);
@@ -870,7 +871,7 @@ void PIBinaryLog::seekTo(int rindex) {
 
 
 bool PIBinaryLog::seek(const PISystemTime & time) {
-	int ci = posForTime(time);
+	const int ci = posForTime(time);
 	if (ci >= 0) {
 		seekTo(ci);
 		return true;
@@ -930,9 +931,9 @@ PIString PIBinaryLog::constructFullPathDevice() const {
 
 
 void PIBinaryLog::configureFromFullPathDevice(const PIString & full_path) {
-	PIStringList pl = full_path.split(":");
+	const PIStringList pl = full_path.split(":");
 	for (int i = 0; i < pl.size_s(); ++i) {
-		PIString p(pl[i]);
+		const PIString p(pl[i]);
 		switch (i) {
 		case 0: setLogDir(p); break;
 		case 1: setFilePrefix(p); break;
@@ -979,7 +980,7 @@ void PIBinaryLog::propertyChanged(const char * s) {
 	default_id  = property("defaultID").toInt();
 	rapid_start = property("rapidStart").toBool();
 	play_mode   = (PlayMode)property("playMode").toInt();
-	double ps   = property("playSpeed").toDouble();
+	const double ps   = property("playSpeed").toDouble();
 	play_speed  = ps > 0. ? 1. / ps : 0.;
 	play_delay  = property("playDelay").toSystemTime();
 	split_mode  = (SplitMode)property("splitMode").toInt();
diff --git a/libs/main/io_devices/pibinarylog.h b/libs/main/io_devices/pibinarylog.h
index 7ae65993..619c7ecc 100644
--- a/libs/main/io_devices/pibinarylog.h
+++ b/libs/main/io_devices/pibinarylog.h
@@ -251,7 +251,7 @@ public:
 	void setHeader(const PIByteArray & header);
 
 	//! Get custom file header
-	PIByteArray getHeader();
+	PIByteArray getHeader() const;
 
 #ifdef DOXYGEN
 	//! Read one message from binlog file, with ID contains in "filterID" or any ID, if "filterID" is empty
@@ -462,9 +462,9 @@ inline PICout operator<<(PICout s, const PIBinaryLog::BinLogInfo & bi) {
 	}
 	s << "read records " << bi.records_count << " in " << bi.records.size() << " types, log size " << bi.log_size;
 	s << "\nlog start " << bi.start_time << " , log end " << bi.end_time;
-	PIVector<int> keys = bi.records.keys();
+	const auto keys = bi.records.keys();
 	for (int i: keys) {
-		PIBinaryLog::BinLogRecordInfo bri = bi.records.at(i);
+		const auto & bri(bi.records.at(i));
 		s << "\n  record id " << bri.id << " , count " << bri.count;
 		s << "\n    record start " << bri.start_time << " , end " << bri.end_time;
 		s << "\n    record size " << bri.minimum_size << " - " << bri.maximum_size;