diff --git a/postprocessors/imp_rec/imp_reconstructor.cpp b/postprocessors/imp_rec/imp_reconstructor.cpp
index de6754fa..0fa51359 100644
--- a/postprocessors/imp_rec/imp_reconstructor.cpp
+++ b/postprocessors/imp_rec/imp_reconstructor.cpp
@@ -198,7 +198,7 @@ pesieve::ImpReconstructor::t_imprec_res pesieve::ImpReconstructor::rebuildImport
 	return IMP_RECOVERY_ERROR;
 }
 
-bool pesieve::ImpReconstructor::printFoundIATs(std::string reportPath)
+bool pesieve::ImpReconstructor::printFoundIATs(const std::string& reportPath)
 {
 	if (!foundIATs.size()) {
 		return false;
diff --git a/postprocessors/imp_rec/imp_reconstructor.h b/postprocessors/imp_rec/imp_reconstructor.h
index 9d94cf58..fd56cfe7 100644
--- a/postprocessors/imp_rec/imp_reconstructor.h
+++ b/postprocessors/imp_rec/imp_reconstructor.h
@@ -198,7 +198,7 @@ namespace pesieve {
 
 		t_imprec_res rebuildImportTable(const IN peconv::ExportsMapper* exportsMap, IN const pesieve::t_imprec_mode &imprec_mode);
 
-		bool printFoundIATs(std::string reportPath);
+		bool printFoundIATs(const std::string &reportPath);
 
 	private:
 
diff --git a/scanners/code_scanner.cpp b/scanners/code_scanner.cpp
index 534ea226..71c8e314 100644
--- a/scanners/code_scanner.cpp
+++ b/scanners/code_scanner.cpp
@@ -10,7 +10,7 @@
 using namespace pesieve;
 using namespace pesieve::util;
 
-size_t pesieve::CodeScanReport::generateTags(std::string reportPath)
+size_t pesieve::CodeScanReport::generateTags(const std::string& reportPath)
 {
 	if (patchesList.size() == 0) {
 		return 0;
diff --git a/scanners/code_scanner.h b/scanners/code_scanner.h
index 24fc6e86..3993f73d 100644
--- a/scanners/code_scanner.h
+++ b/scanners/code_scanner.h
@@ -96,7 +96,7 @@ namespace pesieve {
 			return countSectionsWithStatus(SECTION_SCAN_ERR);
 		}
 
-		size_t generateTags(std::string reportPath);
+		size_t generateTags(const std::string &reportPath);
 
 		std::map<DWORD, t_section_status> sectionToResult;
 		PatchList patchesList;
diff --git a/scanners/iat_scanner.cpp b/scanners/iat_scanner.cpp
index 4af1fe62..0f0f536b 100644
--- a/scanners/iat_scanner.cpp
+++ b/scanners/iat_scanner.cpp
@@ -89,7 +89,7 @@ std::string IATScanReport::formatHookedFuncName(IN peconv::ImportsCollection* st
 	
 }
 
-bool IATScanReport::saveNotRecovered(IN std::string fileName,
+bool IATScanReport::saveNotRecovered(IN const std::string& fileName,
 	IN HANDLE hProcess,
 	IN peconv::ImportsCollection *storedFunc,
 	IN peconv::ImpsNotCovered &notCovered,
diff --git a/scanners/iat_scanner.h b/scanners/iat_scanner.h
index d6234bf8..4e0d9b24 100644
--- a/scanners/iat_scanner.h
+++ b/scanners/iat_scanner.h
@@ -12,7 +12,7 @@ namespace pesieve {
 	{
 	public:
 
-		static bool saveNotRecovered(IN std::string fileName,
+		static bool saveNotRecovered(IN const std::string &fileName,
 			IN HANDLE hProcess,
 			IN peconv::ImportsCollection *storedFunc,
 			IN peconv::ImpsNotCovered &notCovered,
diff --git a/scanners/thread_scanner.cpp b/scanners/thread_scanner.cpp
index 5a5ffb86..10810693 100644
--- a/scanners/thread_scanner.cpp
+++ b/scanners/thread_scanner.cpp
@@ -219,7 +219,7 @@ bool pesieve::ThreadScanner::checkReturnAddrIntegrity(IN const std::vector<ULONG
 	return false;
 }
 
-size_t pesieve::ThreadScanner::analyzeCallStack(IN const std::vector<ULONGLONG> call_stack, IN OUT ctx_details& cDetails)
+size_t pesieve::ThreadScanner::analyzeCallStack(IN const std::vector<ULONGLONG> &call_stack, IN OUT ctx_details& cDetails)
 {
 	size_t processedCntr = 0;
 
diff --git a/scanners/thread_scanner.h b/scanners/thread_scanner.h
index dda45dd4..7ceb26e2 100644
--- a/scanners/thread_scanner.h
+++ b/scanners/thread_scanner.h
@@ -144,7 +144,7 @@ namespace pesieve {
 		bool printResolvedAddr(ULONGLONG addr);
 		bool fetchThreadCtxDetails(IN HANDLE hProcess, IN HANDLE hThread, OUT ctx_details& c);
 		size_t fillCallStackInfo(IN HANDLE hProcess, IN HANDLE hThread, IN LPVOID ctx, IN OUT ctx_details& cDetails);
-		size_t analyzeCallStack(IN const std::vector<ULONGLONG> stack_frame, IN OUT ctx_details& cDetails);
+		size_t analyzeCallStack(IN const std::vector<ULONGLONG> &stack_frame, IN OUT ctx_details& cDetails);
 		bool checkReturnAddrIntegrity(IN const std::vector<ULONGLONG>& callStack);
 		bool fillAreaStats(ThreadScanReport* my_report);
 		bool reportSuspiciousAddr(ThreadScanReport* my_report, ULONGLONG susp_addr);
diff --git a/stats/stats_analyzer.cpp b/stats/stats_analyzer.cpp
index 4e8bd55d..5d346ae9 100644
--- a/stats/stats_analyzer.cpp
+++ b/stats/stats_analyzer.cpp
@@ -56,7 +56,7 @@ namespace pesieve {
 		return points;
 	}
 
-	size_t countFoundStrings(IN const AreaMultiStats& stats, IN std::set<std::string> neededStrings, IN size_t minOccurrence)
+	size_t countFoundStrings(IN const AreaMultiStats& stats, IN const std::set<std::string> &neededStrings, IN size_t minOccurrence)
 	{
 		size_t totalCount = 0;
 		if (!stats.currArea.foundStrings.size()) {
@@ -100,7 +100,7 @@ namespace pesieve {
 	{
 		size_t valsCount = 0;
 		for (auto itr1 = currArea.frequencies.rbegin(); itr1 != currArea.frequencies.rend(); ++itr1) {
-			double counter = itr1->first;
+			double counter = (double)itr1->first;
 			if (counter >= mean) {
 				valsCount += itr1->second.size();
 			}
diff --git a/utils/path_converter.cpp b/utils/path_converter.cpp
index 841af4ee..e218c858 100644
--- a/utils/path_converter.cpp
+++ b/utils/path_converter.cpp
@@ -125,7 +125,7 @@ namespace pesieve {
 			return false;
 		}
 
-		std::string remap_to_drive_letter(std::string full_path)
+		std::string remap_to_drive_letter(const std::string &full_path)
 		{
 			size_t full_path_size = full_path.length();
 			if (full_path_size == 0) {
@@ -237,7 +237,7 @@ std::string pesieve::util::device_path_to_win32_path(const std::string &full_pat
 	return path;
 }
 
-bool is_device_path(std::string path)
+bool is_device_path(const std::string &path)
 {
 	const std::string device_path = "\\Device\\";
 	if (path.length() < device_path.length() || path[0] !='\\') {
@@ -249,7 +249,7 @@ bool is_device_path(std::string path)
 	return false;
 }
 
-std::string pesieve::util::expand_path(std::string path)
+std::string pesieve::util::expand_path(const std::string &path)
 {
 	std::string basic_path = pesieve::util::device_path_to_win32_path(path);
 	if (is_device_path(basic_path)) {
@@ -270,4 +270,3 @@ std::string pesieve::util::expand_path(std::string path)
 	}
 	return strip_prefix(filename, LONG_PATH_PREFIX);
 }
-
diff --git a/utils/path_converter.h b/utils/path_converter.h
index c81548f8..71af1ba7 100644
--- a/utils/path_converter.h
+++ b/utils/path_converter.h
@@ -15,7 +15,7 @@ namespace pesieve {
 		//converts path in format i.e.: \Device\HarddiskVolume2\... to format: C:\...
 		std::string device_path_to_win32_path(const std::string &full_path);
 
-		std::string expand_path(std::string path);
+		std::string expand_path(const std::string &path);
 
 	};
 };