diff --git a/include/utils/SerialPrint.h b/include/utils/SerialPrint.h
index ee3a2d82..73e6c787 100644
--- a/include/utils/SerialPrint.h
+++ b/include/utils/SerialPrint.h
@@ -3,4 +3,4 @@
 #include "utils/TimeUtils.h"
 #include "classes/IoTItem.h"
 
-void SerialPrint(String errorLevel, String module, String msg,  String itemId = "");
\ No newline at end of file
+void SerialPrint(const String& errorLevel, const String& module, const String& msg, const String& itemId = "");
\ No newline at end of file
diff --git a/include/utils/StringUtils.h b/include/utils/StringUtils.h
index 9f2f9d75..7f5b7f90 100644
--- a/include/utils/StringUtils.h
+++ b/include/utils/StringUtils.h
@@ -8,29 +8,29 @@ void hex2string(byte array[], unsigned int len, char buffer[]);
 
 int string2hex(const char* str, unsigned char* bytes);
 
-uint8_t hexStringToUint8(String hex);
+uint8_t hexStringToUint8(const String& hex);
 
-uint16_t hexStringToUint16(String hex);
+uint16_t hexStringToUint16(const String& hex);
 
-String selectToMarkerLast(String str, String found);
+String selectToMarkerLast(String str, const String& found);
 
-String selectToMarker(String str, String found);
+String selectToMarker(String str, const String& found);
 
 String extractInner(String str);
 
-String deleteAfterDelimiter(String str, String found);
+String deleteAfterDelimiter(String str, const String& found);
 
-String deleteBeforeDelimiter(String str, String found);
+String deleteBeforeDelimiter(String str, const String& found);
 
-String deleteBeforeDelimiterTo(String str, String found);
+String deleteBeforeDelimiterTo(String str, const String& found);
 
-String deleteToMarkerLast(String str, String found);
+String deleteToMarkerLast(String str, const String& found);
 
-String selectFromMarkerToMarker(String str, String found, int number);
+String selectFromMarkerToMarker(String str, const String& found, int number);
 
 size_t itemsCount2(String str, const String& separator);
 
-char* stringToChar(String& str);
+char* stringToChar(const String& str);
 
 //size_t itemsCount(String& str, const char* delim);
 
@@ -42,4 +42,4 @@ String prettyBytes(size_t size);
 
 String uint64ToString(uint64_t input, uint8_t base = 10);
 
-String cleanString(String str);
+void cleanString(String& str);
diff --git a/src/utils/SerialPrint.cpp b/src/utils/SerialPrint.cpp
index 22e8b96c..3e32547a 100644
--- a/src/utils/SerialPrint.cpp
+++ b/src/utils/SerialPrint.cpp
@@ -1,23 +1,16 @@
 
 #include "utils/SerialPrint.h"
 
-void SerialPrint(String errorLevel, String module, String msg, String itemId) {
+void SerialPrint(const String& errorLevel, const String& module, const String& msg, const String& itemId) {
     String tosend = prettyMillis(millis());
-    tosend = tosend + " [" + errorLevel + "] [" + module + "] " + msg;
+    tosend += " [";
+    tosend += errorLevel;
+    tosend += "] [";
+    tosend += module;
+    tosend += "] ";
+    tosend += msg;
     Serial.println(tosend);
 
-    if (errorLevel == "E") {
-        msg = cleanString(msg);
-        // создаем событие об ошибке для возможной реакции в сценарии
-        if (itemId != "") {
-            IoTItems.push_back((IoTItem *)new externalVariable("{\"id\":\"" + itemId + "_onError\",\"val\":\"" + msg + "\",\"int\":1}"));
-            generateEvent(itemId + "_onError", "1");
-        } else {
-            IoTItems.push_back((IoTItem *)new externalVariable("{\"id\":\"onError\",\"val\":\"" + module + " " + msg + "\",\"int\":1}"));
-            generateEvent("onError", "1");
-        }
-    } 
-
     if (isNetworkActive()) {
         if (jsonReadInt(settingsFlashJson, F("log")) != 0) {
             // String pl = "/log|" + tosend;
@@ -25,4 +18,18 @@ void SerialPrint(String errorLevel, String module, String msg, String itemId) {
             sendStringToWs("corelg", tosend, -1);
         }
     }
+
+    if (errorLevel == "E") {
+        cleanString(tosend);
+        // создаем событие об ошибке для возможной реакции в сценарии
+        if (itemId != "") {
+            IoTItems.push_back((IoTItem *)new externalVariable("{\"id\":\"" + itemId + "_onError\",\"val\":\"" + tosend + "\",\"int\":1}"));
+            generateEvent(itemId + "_onError", "1");
+        } else {
+            IoTItems.push_back((IoTItem *)new externalVariable("{\"id\":\"onError\",\"val\":\"" + module + " " + tosend + "\",\"int\":1}"));
+            generateEvent("onError", "1");
+        }
+    } 
+
+    
 }
\ No newline at end of file
diff --git a/src/utils/StringUtils.cpp b/src/utils/StringUtils.cpp
index eb869812..a2a425d4 100644
--- a/src/utils/StringUtils.cpp
+++ b/src/utils/StringUtils.cpp
@@ -8,12 +8,12 @@ void writeUint8tToString(uint8_t* payload, size_t length, size_t headerLenth, St
     }
 }
 
-String selectToMarkerLast(String str, String found) {
+String selectToMarkerLast(String str, const String& found) {
     int p = str.lastIndexOf(found);
     return str.substring(p + found.length());
 }
 
-String selectToMarker(String str, String found) {
+String selectToMarker(String str, const String& found) {
     int p = str.indexOf(found);
     return str.substring(0, p);
 }
@@ -24,32 +24,32 @@ String extractInner(String str) {
     return str.substring(p1 + 1, p2);
 }
 
-String deleteAfterDelimiter(String str, String found) {
+String deleteAfterDelimiter(String str, const String& found) {
     int p = str.indexOf(found);
     return str.substring(0, p);
 }
 
-String deleteBeforeDelimiter(String str, String found) {
+String deleteBeforeDelimiter(String str, const String& found) {
     int p = str.indexOf(found) + found.length();
     return str.substring(p);
 }
 
-String deleteBeforeDelimiterTo(String str, String found) {
+String deleteBeforeDelimiterTo(String str, const String& found) {
     int p = str.indexOf(found);
     return str.substring(p);
 }
 
-String deleteToMarkerLast(String str, String found) {
+String deleteToMarkerLast(String str, const String& found) {
     int p = str.lastIndexOf(found);
     return str.substring(0, p);
 }
 
-String selectToMarkerPlus(String str, String found, int plus) {
+String selectToMarkerPlus(String str, const String& found, int plus) {
     int p = str.indexOf(found);
     return str.substring(0, p + plus);
 }
 
-String selectFromMarkerToMarker(String str, String tofind, int number) {
+String selectFromMarkerToMarker(String str, const String& tofind, int number) {
     if (str.indexOf(tofind) == -1) {
         return "not found";
     }
@@ -98,14 +98,14 @@ int string2hex(const char* str, unsigned char* bytes) {
     return i;
 }
 
-uint8_t hexStringToUint8(String hex) {
+uint8_t hexStringToUint8(const String& hex) {
     uint8_t tmp = strtol(hex.c_str(), NULL, 0);
     if (tmp >= 0x00 && tmp <= 0xFF) {
         return tmp;
     }
 }
 
-uint16_t hexStringToUint16(String hex) {
+uint16_t hexStringToUint16(const String& hex) {
     uint16_t tmp = strtol(hex.c_str(), NULL, 0);
     if (tmp >= 0x0000 && tmp <= 0xFFFF) {
         return tmp;
@@ -141,7 +141,7 @@ size_t itemsCount2(String str, const String& separator) {
 //     return cnt;
 // }
 
-char* stringToChar(String& str) {
+char* stringToChar(const String& str) {
     char* mychar = new char[str.length() + 1];
     strcpy(mychar, str.c_str());
     return mychar;
@@ -199,11 +199,9 @@ String uint64ToString(uint64_t input, uint8_t base) {
     return result;
 }
 
-String cleanString(String str) {
-    String clearStr = "";
-    const String allowedChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890АБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдеёжзийклмнопрстуфхцчшщъыьэюя.!-+ ";
+void cleanString(String& str) {
+    const String allowedChars = F("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890АБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдеёжзийклмнопрстуфхцчшщъыьэюя.!-+ ");
     for (size_t i = 0; i < str.length(); i++) {
-        if (allowedChars.indexOf(str.charAt(i)) != -1) clearStr += str.charAt(i);
+        if (allowedChars.indexOf(str.charAt(i)) == -1) str.setCharAt(i, ' ');
     }
-    return clearStr;
 }
\ No newline at end of file