Problem saving .xlsx file via PHPExcel?

Question

PHP

the bottom line is that in the script I load the file, change 3 values ​​​​and save it to a new file.
BUT, firstly, it saves for a terribly long time, and secondly, a file that weighed 22KB becomes 2509KB.
here is a sample code:
$inputFileName = __DIR__.'\\files\\sample.xlsx';
try {
$objPHPExcel = PHPExcel_IOFactory::load($inputFileName);
}catch(Exception $Exception){
echo $Exception;
}
echo "File upload";
// Set the active sheet index
$objPHPExcel->setActiveSheetIndex(0);
// Get the active sheet
$sheet = $objPHPExcel->getActiveSheet();
$sheet->setTitle("New");
$sheet -> setCellValue('A6','2Nikita');
$sheet -> setCellValue('B6','2Hello');
$sheet -> setCellValue('C6', 'World2');
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, "Excel2007");
try{
$objWriter->save(__DIR__.'\\files\\Test4.xlsx' );
}catch(Exception $Exception){
echo $Exception;
}
echo "file saved";

Answer 1

1. Change xlsx extension to zip
   
2. Unzip.
   
3. Find the xml file with the data and replace the necessary values ​​(there one file is responsible for storing data, and the other for arranging this data in cells)
   
4. Zip the file and rename the file extension back to xlsx