diff --git a/PowerEditor/src/NppIO.cpp b/PowerEditor/src/NppIO.cpp
index b0f84b5b0..38479b3c9 100644
--- a/PowerEditor/src/NppIO.cpp
+++ b/PowerEditor/src/NppIO.cpp
@@ -1499,7 +1499,7 @@ bool Notepad_plus::fileSave(BufferID id)
 		const NppGUI & nppgui = (NppParameters::getInstance()).getNppGUI();
 		BackupFeature backup = nppgui._backup;
 
-		if (backup != bak_none)
+		if (backup != bak_none && !buf->isLargeFile())
 		{
 			const TCHAR *fn = buf->getFullPathName();
 			TCHAR *name = ::PathFindFileName(fn);
diff --git a/PowerEditor/src/NppNotification.cpp b/PowerEditor/src/NppNotification.cpp
index 01a78d648..275b2723d 100644
--- a/PowerEditor/src/NppNotification.cpp
+++ b/PowerEditor/src/NppNotification.cpp
@@ -660,11 +660,15 @@ BOOL Notepad_plus::notify(SCNotification *notification)
 				if (indentMaintain)
 					maintainIndentation(static_cast<TCHAR>(notification->ch));
 
-				AutoCompletion * autoC = isFromPrimary ? &_autoCompleteMain : &_autoCompleteSub;
-				bool isColumnMode = _pEditView->execute(SCI_GETSELECTIONS) > 1; // Multi-Selection || Column mode)
-				if (nppGui._matchedPairConf.hasAnyPairsPair() && !isColumnMode)
-					autoC->insertMatchedChars(notification->ch, nppGui._matchedPairConf);
-				autoC->update(notification->ch);
+				Buffer* currentBuf = _pEditView->getCurrentBuffer();
+				if (!currentBuf->isLargeFile())
+				{
+					AutoCompletion* autoC = isFromPrimary ? &_autoCompleteMain : &_autoCompleteSub;
+					bool isColumnMode = _pEditView->execute(SCI_GETSELECTIONS) > 1; // Multi-Selection || Column mode)
+					if (nppGui._matchedPairConf.hasAnyPairsPair() && !isColumnMode)
+						autoC->insertMatchedChars(notification->ch, nppGui._matchedPairConf);
+					autoC->update(notification->ch);
+				}
 			}
 			break;
 		}
diff --git a/PowerEditor/src/ScintillaComponent/Buffer.cpp b/PowerEditor/src/ScintillaComponent/Buffer.cpp
index 9e4f86788..f9c04a89e 100644
--- a/PowerEditor/src/ScintillaComponent/Buffer.cpp
+++ b/PowerEditor/src/ScintillaComponent/Buffer.cpp
@@ -654,11 +654,26 @@ BufferID FileManager::loadFile(const TCHAR* filename, Document doc, int encoding
 	int64_t fileSize = _ftelli64(fp);
 	fclose(fp);
 	
+	// * the auto-completion feature will be disabled for large files
+	// * the session snapshotsand periodic backups feature will be disabled for large files
+	// * the backups on save feature will be disabled for large files
+	bool isLargeFile = fileSize >= NPP_STYLING_FILESIZE_LIMIT;
+
+	// Due to the performance issue, the Word Wrap feature will be disabled if it's ON
+	if (isLargeFile)
+	{
+		bool isWrap = _pNotepadPlus->_pEditView->isWrap();
+		if (isWrap)
+		{
+			_pNotepadPlus->command(IDM_VIEW_WRAP);
+		}
+	}
+
 	bool ownDoc = false;
 	if (!doc)
 	{
 		// If file exceeds 200MB, activate large file mode
-		doc = (Document)_pscratchTilla->execute(SCI_CREATEDOCUMENT, 0, fileSize < NPP_STYLING_FILESIZE_LIMIT ? 0 : SC_DOCUMENTOPTION_STYLES_NONE | SC_DOCUMENTOPTION_TEXT_LARGE);
+		doc = (Document)_pscratchTilla->execute(SCI_CREATEDOCUMENT, 0, isLargeFile ? SC_DOCUMENTOPTION_STYLES_NONE | SC_DOCUMENTOPTION_TEXT_LARGE : 0);
 		ownDoc = true;
 	}
 
@@ -706,6 +721,8 @@ BufferID FileManager::loadFile(const TCHAR* filename, Document doc, int encoding
 		if (res != 0) // res == 1 or res == -1
 			newBuf->_timeStamp = fileNameTimestamp;
 
+		newBuf->_isLargeFile = isLargeFile;
+
 		_buffers.push_back(newBuf);
 		++_nbBufs;
 		Buffer* buf = _buffers.at(_nbBufs - 1);
@@ -893,9 +910,12 @@ std::mutex backup_mutex;
 
 bool FileManager::backupCurrentBuffer()
 {
+	Buffer* buffer = _pNotepadPlus->getCurrentBuffer();
+	if (buffer->isLargeFile())
+		return false;
+
 	std::lock_guard<std::mutex> lock(backup_mutex);
 
-	Buffer* buffer = _pNotepadPlus->getCurrentBuffer();
 	bool result = false;
 	bool hasModifForSession = false;
 
@@ -1387,18 +1407,13 @@ bool FileManager::loadFileData(Document doc, int64_t fileSize, const TCHAR * fil
 
 			int res = pNativeSpeaker->messageBox("WantToOpenHugeFile",
 				_pNotepadPlus->_pEditView->getHSelf(),
-				TEXT("Opening a huge file of 2GB+ could take several minutes.\nDo you want to open it?\n(Due to the performance issue, the Word Wrap feature will be disabled if it's ON)"),
+				TEXT("Opening a huge file of 2GB+ could take several minutes.\nDo you want to open it?"),
 				TEXT("Opening huge file warning"),
 				MB_YESNO | MB_APPLMODAL);
 
 			if (res == IDYES)
 			{
-				// Due to the performance issue, the Word Wrap feature will be disabled if it's ON
-				bool isWrap = _pNotepadPlus->_pEditView->isWrap();
-				if (isWrap)
-				{
-					_pNotepadPlus->command(IDM_VIEW_WRAP);
-				}
+				// Do nothing
 			}
 			else
 			{
diff --git a/PowerEditor/src/ScintillaComponent/Buffer.h b/PowerEditor/src/ScintillaComponent/Buffer.h
index 74c057b9f..4d80ac5f9 100644
--- a/PowerEditor/src/ScintillaComponent/Buffer.h
+++ b/PowerEditor/src/ScintillaComponent/Buffer.h
@@ -292,6 +292,8 @@ public:
 	bool isUnsync() const { return _isUnsync; }
 	void setUnsync(bool val) { _isUnsync = val; }
 
+	bool isLargeFile() const { return _isLargeFile; }
+
 	void startMonitoring() { 
 		_isMonitoringOn = true; 
 		_eventHandle = ::CreateEvent(nullptr, TRUE, FALSE, nullptr);
@@ -344,6 +346,7 @@ private:
 	bool _isUserReadOnly = false;
 	bool _needLexer = false; // new buffers do not need lexing, Scintilla takes care of that
 	//these properties have to be duplicated because of multiple references
+
 	//All the vectors must have the same size at all times
 	std::vector<ScintillaEditView *> _referees; // Instances of ScintillaEditView which contain this buffer
 	std::vector<Position> _positions;
@@ -372,6 +375,7 @@ private:
 	                        // 2. the file is modified by another app but the buffer is not reloaded in Notepad++.
 	                        // Note that if the buffer is untitled, there's no correspondent file on the disk so the buffer is considered as independent therefore synchronized.
 
+	bool _isLargeFile = false; // The loading of huge files will disable automatically 1. auto-completion 2. snapshot periode backup 3. backup on save 4. word wrap
 
 	// For the monitoring
 	HANDLE _eventHandle = nullptr;