diff --git a/Classes/PHPExcel/Worksheet.php b/Classes/PHPExcel/Worksheet.php
index 3ba25e4..64096f9 100644
--- a/Classes/PHPExcel/Worksheet.php
+++ b/Classes/PHPExcel/Worksheet.php
@@ -1661,10 +1661,10 @@ class PHPExcel_Worksheet implements PHPExcel_IComparable
 			PHPExcel_Cell::stringFromColumnIndex($pColumn2) . $pRow2
 		);
 	}
-    
+
     /**
      * Remove autofilter
-     * 
+     *
      * @return PHPExcel_Worksheet
      */
     public function removeAutoFilter()
@@ -2150,36 +2150,42 @@ class PHPExcel_Worksheet implements PHPExcel_IComparable
 		// Garbage collect...
 		$this->garbageCollect();
 
-		// Loop through rows
-		$r = -1;
-		$rowIterator = $this->getRowIterator();
-		foreach ($rowIterator as $row) {
-			++$r;
-			$cellIterator = $row->getCellIterator();
-			$cellIterator->setIterateOnlyExistingCells(true); // Loop through each cell in the current row
-			$c = -1;
-			foreach ($cellIterator as $cell) {
-				++$c;
-				$rRef = ($returnCellRef) ? $cell->getRow() : $r;
-				$cRef = ($returnCellRef) ? $cell->getColumn() : $c;
-				if (!is_null($cell)) {
-					// Cell exists?
-					if ($cell->getValue() instanceof PHPExcel_RichText) {
-						$returnValue[$rRef][$cRef] = $cell->getValue()->getPlainText();
-					} else {
-						if ($calculateFormulas) {
-							$returnValue[$rRef][$cRef] = $cell->getCalculatedValue();
-						} else {
-							$returnValue[$rRef][$cRef] = $cell->getValue();
-						}
-					}
+		//	Identify the range that we need to extract from the worksheet
+		$maxCol = $this->getHighestColumn();
+		$maxRow = $this->getHighestRow();
+		$maxCol++;
 
-					if ($formatData) {
-						$style = $this->_parent->getCellXfByIndex($cell->getXfIndex());
-						$returnValue[$rRef][$cRef] = PHPExcel_Style_NumberFormat::toFormattedString($returnValue[$rRef][$cRef], $style->getNumberFormat()->getFormatCode());
+		// Loop through rows
+		for ($row = 1; $row <= $maxRow; ++$row) {
+			$c = -1;
+			// Loop through columns in the current row
+			for ($col = 'A'; $col != $maxCol; ++$col) {
+				$rRef = ($returnCellRef) ? $row : $row-1;
+				$cRef = ($returnCellRef) ? $col : ++$c;
+				//	Using getCell() will create a new cell if it doesn't already exist. We don't want that to happen
+				//		so we test and retrieve directly against _cellCollection
+				if ($this->_cellCollection->isDataSet($col.$row)) {
+					// Cell exists
+					$cell = $this->_cellCollection->getCacheData($col.$row);
+					if ($cell->getValue() !== null) {
+						if ($cell->getValue() instanceof PHPExcel_RichText) {
+							$returnValue[$rRef][$cRef] = $cell->getValue()->getPlainText();
+						} else {
+							if ($calculateFormulas) {
+								$returnValue[$rRef][$cRef] = $cell->getCalculatedValue();
+							} else {
+								$returnValue[$rRef][$cRef] = $cell->getValue();
+							}
+						}
+
+						if ($formatData) {
+							$style = $this->_parent->getCellXfByIndex($cell->getXfIndex());
+							$returnValue[$row][$cRef] = PHPExcel_Style_NumberFormat::toFormattedString($returnValue[$rRef][$cRef], $style->getNumberFormat()->getFormatCode());
+						}
+					} else {
+						// Cell doesn't exist
+						$returnValue[$rRef][$cRef] = $nullValue;
 					}
-				} else {
-					$returnValue[$rRef][$cRef] = $nullValue;
 				}
 			}
 		}
diff --git a/changelog.txt b/changelog.txt
index 9b70962..c94b29a 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -27,13 +27,14 @@ Fixed in SVN:
 - Feature:  (MBaker) Provide option to use PCLZip as an alternative to ZipArchive.
 					 This allows the writing of Excel2007 files, even without ZipArchive enabled (it does require zlib), or when php_zip is one of the buggy PHP 5.2.6 or 5.2.8 versions
 - Feature:	(MBaker) Work item 14979 - Added listWorksheetNames() method to Readers that support multiple worksheets in a workbook, allowing a user to extract a list of all the worksheet names from a file without parsing/loading the whole file.
+- Feature:	(MBaker) Speed boost and memory reduction in the Worksheet toArray() method.
 - Bugfix:   (MBaker) Work item 14888 - Simple =IF() formula disappears
 - Bugfix:	(MBaker) Work item 14898 - PHP Warning: preg_match(): Compilation failed: PCRE does not support \\L, \\l, \\N, \\P, \\p, \\U, \\u, or \\X
 - Bugfix:	(MBaker) Work item 14901 - VLOOKUP choking on parameters in PHPExcel.1.7.5/PHPExcel_Writer_Excel2007
 - Bugfix:	(MBaker) Work item 14973 - PHPExcel_Cell::isInRange() incorrect results - offset by one column
 - Bugfix:   (MBaker) Treat CodePage of 0 as CP1251 (for .xls files written by applications that don't set the CodePage correctly, such as Apple Numbers)
-- Bugfix:	(MB) Work item 11583 - Need method for removing autoFilter 
-- Bugfix:	(MBaker) Work item 15029 - coordinateFromString throws exception for rows greater than 99,999 
+- Bugfix:	(MB) Work item 11583 - Need method for removing autoFilter
+- Bugfix:	(MBaker) Work item 15029 - coordinateFromString throws exception for rows greater than 99,999
 
 
 2010-12-10 (v1.7.5):