PHP draining CPU

[slarson20]

I notice when people load pages with tons of cropped images PHP drains my CPU.

 

	  $src = $_GET["SRC"];
  $dimension = $_GET["DIMENSION"]; 
      list($width, $height) = getimagesize($src);
      $src = imagecreatefromjpeg($src);
      $new_image = imagecreatetruecolor($dimension, $dimension);
      if($width > $height && $width != $height){
        $difference = $width - $height;
        $cut = $difference / 2;
        imagecopyresampled($new_image, $src, 0, 0, $cut, 0, $dimension, $dimension, $height, $height);
  }elseif($height > $width && $width != $height){ 
    $difference = $height - $width;
    $cut = $difference * .2;
        imagecopyresampled($new_image, $src, 0, 0, 0, $cut, $dimension, $dimension, $width, $width);
      }elseif($width == $height){
        imagecopyresampled($new_image, $src, 0, 0, 0, 0, $dimension, $dimension, $width, $height);
  }
      header("Content-type: image/jpeg");
      imagejpeg($new_image, NULL, 100);
      imagedestroy($new_image);

 

Here is my code for the cropping.

 

Is cropping smaller images easier on the CPU? Should I create a cropped version on upload to prevent re cpu usage later?

 

Whats good cpu saving techniques on cropping images?

[TrueColors]

You could check if a cropped file exists, if so - load that image else crop the original image and save it as a cropped file. That should dramatically lower CPU usage.