Create and show thumbnails

I am calling show_thumb to create thumbnails , but I am realizing that it is making the site load a little bit slower.

Below are two functions: show_thumb function that shows the thumbnail and make_thumb_gd that takes care of the thumbnail. Any suggestion on making it faster? The current approach makes the site slow, because those thumbnails are shown in the moving Jcarousel that contains the links returned by show_thumb.

Show thumb function

function show_thumb($file_org, $width, $height,$folder_version,$ratio_type = 'width')
{

    $file_name = str_replace(SITE_WS_PATH."/", "", $file_org);
    $file_name = str_replace("/", "^", $file_name);
    $file_name = preg_replace("/[ ]+/", "_", $file_name);
    $cache_file = $width."x".$height.'__'.$ratio_type .'__'.$file_name;
    $folder_version = trim($folder_version); 

    if($folder_version =="english"){

        $version ="";
    }
    else {

        $version = $folder_version;
    }

    $file_fs_path = str_replace(SITE_WS_PATH, ROOT, $file_org); 

    if(!is_file(ROOT."/".$version."/".THUMB_CACHE_DIR."/".$cache_file)) {

       $d = make_thumb_gd($file_fs_path, ROOT."/".$version."/".THUMB_CACHE_DIR."/".$cache_file, $width, $height, $ratio_type );



    }else{
        @unlink(ROOT."/".$version."/".THUMB_CACHE_DIR."/".$cache_file);
        make_thumb_gd_1($file_fs_path, ROOT."/".$version."/".THUMB_CACHE_DIR."/".$cache_file, $width, $height, $ratio_type );
    }

    if($folder_version =="english"){

        $link = SITE_WS_PATH."/".THUMB_CACHE_DIR."/".$cache_file;
    }
    else {

        $link = SITE_WS_PATH."/".$folder_version."/".THUMB_CACHE_DIR."/".$cache_file;
    }   

    return $link;
}

Make thumb function

function make_thumb_gd($imgPath, $destPath, $newWidth, $newHeight, $ratio_type = 'width', $quality = 60, $verbose = false)
{ 
    // options for ratio type = width|height|distort|crop
    // get image info (0 width and 1 height, 2 is (1 = GIF, 2 = JPG, 3 = PNG)
    $size = @getimagesize($imgPath); 
    // break and return false if failed to read image infos
    if (!$size) {
        if ($verbose) {
            echo "Unable to read image info.";
        }
        return false;
    } 
    $curWidth   = $size[0];
    $curHeight  = $size[1];
    $fileType   = $size[2];

    // width/height ratio
    $ratio =  $curWidth/$curHeight;

    $srcX = 0;
    $srcY = 0;
    $srcWidth = $curWidth;
    $srcHeight = $curHeight;

    if($ratio_type=='width') {
        // If the dimensions for thumbnails are greater than original image do not enlarge
        if($newWidth > $curWidth) {
            $newWidth = $curWidth;
        }
        $newHeight  = $newWidth / $ratio;
    }else if($ratio_type=='crop') {
        $thumbRatio = $newWidth / $newHeight;
        if($ratio < $thumbRatio) {
            $srcHeight = round($curHeight*$ratio/$thumbRatio);
            $srcY = round(($curHeight-$srcHeight)/2);
        } else {
            $srcWidth = round($curWidth*$thumbRatio/$ratio);
            $srcX = round(($curWidth-$srcWidth)/2);
        }
        /*echo "<br>curWidth: $curWidth";
        echo "<br>curHeight: $curHeight";
        echo "<br>newWidth: $newWidth";
        echo "<br>newHeight: $newHeight";
        echo "<br>ratio: $ratio";
        echo "<br>thumbRatio: $thumbRatio";
        echo "<br>srcWidth: $srcWidth";
        echo "<br>srcX: $srcX";
        echo "<br>srcHeight: $srcHeight";
        echo "<br>srcY: $srcY";*/
    } else if($ratio_type=='height') {
        // If the dimensions for thumbnails are greater than original image do not enlarge
        if($newHeight > $curHeight) {
            $newHeight = $curHeight;
        }
        $newWidth   = $newHeight * $ratio;
    } else if($ratio_type=='distort') {
    }

    // create image
    switch ($fileType) {
        case 1:
            if (function_exists("imagecreatefromgif")) {
                $originalImage = imagecreatefromgif($imgPath);
            } else {
                if ($verbose) {
                    echo "GIF images are not support in this php installation.";
                    return false;
                }
            } 
            $fileExt = 'gif';
            break;
        case 2: 
            $originalImage = imagecreatefromjpeg($imgPath);
            $fileExt = 'jpg';
            break;
        case 3: 
            $quality = 9;
            $originalImage = imagecreatefrompng($imgPath);
            $fileExt = 'png';
            break;
        default:
            if ($verbose) {
                echo "Not a valid image type.";
            }
            return false;
    } 
    // create new image

    $resizedImage = imagecreatetruecolor($newWidth, $newHeight);
    //echo "$srcX, $srcY, $newWidth, $newHeight, $curWidth, $curHeight";
    //echo "<br>$srcX, $srcY, $newWidth, $newHeight, $srcWidth, $srcHeight<br>";
    imagecopyresampled($resizedImage, $originalImage, 0, 0, $srcX, $srcY, $newWidth, $newHeight, $srcWidth, $srcHeight);
    switch ($fileExt) {
        case 'gif':
            imagegif($resizedImage, $destPath, $quality);
            break;
        case 'jpg': 
            imagejpeg($resizedImage, $destPath, $quality);
            break;
        case 'png':
            $quality = 9;
            imagepng($resizedImage, $destPath, $quality);
            break;
    } 
    // return true if successfull
    return true;
}