for ($char = 'A'; $char <= 'Z'; $char++) { $objPHPExcel->getActiveSheet()->setCellValue($char.'5','40'); } for ($i=1;$i<=100;$i++){ $objPHPExcel->getActiveSheet()->setCellValue('A'.$i,generateRandomString()); } $objPHPExcel->getActiveSheet()->freezePane('B');
$ objPHPExcel-> getActiveSheet () → freezePane ('B');
Slowdown did not occur for column "A" (first column).
Attached FYI screen shot.
Freezing did not occur for column "A" (first column). When I scroll through COL A, I don't freeze, col A also lights up. 
Bharanikumar
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