diff --git a/Library/ConfigParser.h b/Library/ConfigParser.h
index 1c003d81..4a048879 100644
--- a/Library/ConfigParser.h
+++ b/Library/ConfigParser.h
@@ -117,7 +117,7 @@ private:
 
 	static std::wstring StrToLower(const std::wstring& str) { std::wstring strTmp(str); StrToLowerC(strTmp); return strTmp; }
 	static std::wstring StrToLower(const WCHAR* str) { std::wstring strTmp(str); StrToLowerC(strTmp); return strTmp; }
-	static std::wstring& StrToLowerC(std::wstring& str) { std::transform(str.begin(), str.end(), str.begin(), ::towlower); return str; }
+	static std::wstring& StrToLowerC(std::wstring& str) { _wcslwr(&str[0]); return str; }
 
 	std::wstring m_Filename;
 
diff --git a/Library/Export.cpp b/Library/Export.cpp
index 812edd87..1ba48781 100644
--- a/Library/Export.cpp
+++ b/Library/Export.cpp
@@ -136,15 +136,12 @@ LPCWSTR PluginBridge(LPCWSTR _sCommand, LPCWSTR _sData)
 
 	NULLCHECK(_sData);
 
-	std::wstring sCommand = _sCommand;
-	std::transform(sCommand.begin(), sCommand.end(), sCommand.begin(), ::towlower);
-
 	// Command       GetConfig
 	// Data          unquoted full path and filename given to the plugin on initialize
 	//               (note: this is CaSe-SeNsItIvE!)
 	// Execution     none
 	// Result        the config name if found or a blank string if not
-	if (sCommand == L"getconfig")
+	if (_wcsicmp(_sCommand, L"GetConfig") == 0)
 	{
 		// returns the config name, lookup by INI file
 
@@ -164,7 +161,7 @@ LPCWSTR PluginBridge(LPCWSTR _sCommand, LPCWSTR _sData)
 	// Data          [the config name]
 	// Execution     none
 	// Result        the HWND to the specified config window if found, 'error' otherwise
-	if (sCommand == L"getwindow")
+	if (_wcsicmp(_sCommand, L"GetWindow") == 0)
 	{
 		std::vector<std::wstring> subStrings = CRainmeter::ParseString(_sData);
 
@@ -189,7 +186,7 @@ LPCWSTR PluginBridge(LPCWSTR _sCommand, LPCWSTR _sData)
 	// Data          [the config name]
 	// Execution     none
 	// Result        the value of the variable
-	if (sCommand == L"getvariable")
+	if (_wcsicmp(_sCommand, L"GetVariable") == 0)
 	{
 		std::vector<std::wstring> subStrings = CRainmeter::ParseString(_sData);
 
@@ -201,11 +198,9 @@ LPCWSTR PluginBridge(LPCWSTR _sCommand, LPCWSTR _sData)
 			if (meterWindow)
 			{
 				const std::wstring& variable = subStrings[1];
-				std::wstring result_from_parser;
 
-				if (meterWindow->GetParser().GetVariable(variable, result_from_parser))
+				if (meterWindow->GetParser().GetVariable(variable, g_Buffer))
 				{
-					g_Buffer = result_from_parser;
 					return g_Buffer.c_str();
 				}
 			}
@@ -218,7 +213,7 @@ LPCWSTR PluginBridge(LPCWSTR _sCommand, LPCWSTR _sData)
 	// Data          [the config name] [variable data]
 	// Execution     the indicated variable is updated
 	// Result        'success' if the config was found, 'error' otherwise
-	if (sCommand == L"setvariable")
+	if (_wcsicmp(_sCommand, L"SetVariable") == 0)
 	{
 		std::vector<std::wstring> subStrings = CRainmeter::ParseString(_sData);
 
diff --git a/Library/Group.cpp b/Library/Group.cpp
index f17307ac..0bce7055 100644
--- a/Library/Group.cpp
+++ b/Library/Group.cpp
@@ -70,7 +70,7 @@ std::wstring CGroup::CreateGroup(const std::wstring& str)
 		strTmp.assign(str, pos, str.find_last_not_of(L" \t\r\n") - pos + 1);
 
 		// Convert to lower
-		std::transform(strTmp.begin(), strTmp.end(), strTmp.begin(), ::towlower);
+		_wcslwr(&strTmp[0]);
 	}
 
 	return strTmp;
diff --git a/Library/MathParser.cpp b/Library/MathParser.cpp
index 8d55606d..4fd37d9d 100644
--- a/Library/MathParser.cpp
+++ b/Library/MathParser.cpp
@@ -22,7 +22,6 @@
 #include "MeasureCalc.h"
 #include "MathParser.h"
 
-static const int MAX_STACK_SIZE = 96;
 static const double M_E = 2.7182818284590452354;
 static const double M_PI = 3.14159265358979323846;
 
@@ -172,8 +171,8 @@ static int FindSymbol(const WCHAR* str);
 
 struct Parser
 {
-	Operation opStack[MAX_STACK_SIZE];
-	double valStack[MAX_STACK_SIZE];
+	Operation opStack[96];
+	double valStack[64];
 	char opTop;
 	char valTop;
 	int obrDist;
@@ -210,28 +209,23 @@ WCHAR eInvPrmCnt[] = L"Invalid function parameter count";
 
 WCHAR* MathParser::Check(const WCHAR* formula)
 {
-	int BrCnt = 0;
+	int brackets = 0;
 
 	// Brackets Matching
 	while (*formula)
 	{
 		if (*formula == L'(')
 		{
-			++BrCnt;
+			++brackets;
 		}
 		else if (*formula == L')')
 		{
-			--BrCnt;
+			--brackets;
 		}
 		++formula;
 	}
 
-	if (BrCnt != 0)
-	{
-		return eBrackets;
-	}
-
-	return NULL;
+	return (brackets != 0) ? eBrackets : NULL;
 }
 
 WCHAR* MathParser::CheckParse(const WCHAR* formula, double* result)
@@ -260,6 +254,12 @@ WCHAR* MathParser::Parse(const WCHAR* formula, CMeasureCalc* calc, double* resul
 	WCHAR* error;
 	for (;;)
 	{
+		if ((parser.opTop == _countof(parser.opStack) - 2) ||
+			(parser.valTop == _countof(parser.valStack) - 2))
+		{
+			return eInternal;
+		}
+
 		MathTokenType token = GetNextToken(lexer);
 		--parser.obrDist;
 		switch (token)
diff --git a/Library/MeterString.cpp b/Library/MeterString.cpp
index e3bd74e2..532bf964 100644
--- a/Library/MeterString.cpp
+++ b/Library/MeterString.cpp
@@ -32,19 +32,16 @@ std::unordered_map<std::wstring, Gdiplus::Font*> CMeterString::c_Fonts;
 
 void StringToUpper(std::wstring& str)
 {
-	//change each element of the string to upper case
-	std::transform(str.begin(), str.end(), str.begin(), ::towupper);
+	_wcsupr(&str[0]);
 }
 
 void StringToLower(std::wstring& str)
 {
-	//change each element of the string to lower case
-	std::transform(str.begin(), str.end(), str.begin(), ::towlower);
+	_wcslwr(&str[0]);
 }
 
 void StringToProper(std::wstring& str)
 {
-	//change each element of the string to lower case
 	if (!str.empty())
 	{
 		str[0] = towupper(str[0]);
diff --git a/Library/TintedImage.cpp b/Library/TintedImage.cpp
index fee06a43..a08392d2 100644
--- a/Library/TintedImage.cpp
+++ b/Library/TintedImage.cpp
@@ -42,7 +42,7 @@ public:
 		{
 			key = name;
 		}
-		std::transform(key.begin(), key.end(), key.begin(), ::towlower);
+		_wcslwr(&key[0]);
 
 		size_t len = _snwprintf_s(buffer, _TRUNCATE, L":%llx:%x", time, size);
 		key.append(buffer, len);