Mpdf takes too much time to generate PDF - php

Question

I'm using mPDF in Yii2 php framwork to generate the pdf as report.
getting the result as expected but it is taking too much time to generate the pdf-report (around 5-10 sec).
Pdf
This is the code for mPdf setup
ini_set('memory_limit', '6144M');
set_time_limit(10000);
$path = \Yii::getAlias("#vendor/MPDF/mpdf.php");
require_once($path);
$mpdf = new \mPDF('en-GB-x', '', '', '', 5, 5, 5, 5, 6, 3);
$mpdf->addPage('P');
$mpdf->packTableData = true;
$mpdf->SetDisplayMode('fullpage');
$mpdf->list_indent_first_level = 0;
$mpdf->showWatermarkText = true;
$mpdf->watermarkTextAlpha = 0.3;
$mpdf->simpleTables = true;
$file_name = '';
And this is the main code to generate PDF
$table = "<table width='100%'>";
$table .= "<thead>";
$table .= "<tr>";
$table .= "<td colspan='1' style='width: 20%;' align='left'></td>";
$table .= "<td colspan='5' style='width: 60%;' align='center'>";
$table .= "<h3 style='margin-top:20px; font-size: 26px;'>" . $ofc_detail['company_name'] . "</h3>";
$table .= "</td>";
$table .= "<td colspan='1' style='width: 40%; font-size: 12px;' align='center'>";
$table .= "<div><img src='" . $photo . "' width='31' height='50' /><br /></div>";
$table .= "</td>";
$table .= "</tr>";
$table .= "<tr >";
$table .= "<th colspan='7'><center>QUOTE</center></th>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th colspan='7' align='left'>Date :" . $quotation_date . "</th>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th colspan='7' align='left'>Quotation ID :" . $quotation_id . "</th>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th colspan='7' align='left'>Created By :" . $created_by . "</th>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th height='40' colspan='7' align='left'></th>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th colspan='7' align='left'>To</th>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th align='left'>Customer Name</th>";
$table .= "<td colspan='6'>" . $cust_name . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th align='left'>Mobile </th>";
$table .= "<td colspan='6'>" . $mobile . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th align='left'>Company Name</th>";
$table .= "<td colspan='6'>" . $organization . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th align='left'>GST No.</th>";
$table .= "<td colspan='6'>" . $gst_no . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th align='left'>Address</th>";
$table .= "<td colspan='6'>" . $addr_str . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th align='left'></th>";
$table .= "<td colspan='6'>" . $addr_delivery . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th height='60' colspan='7' align='left'></th>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th colspan='7'><center>Sub: - " . $subject . "</center></th>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td colspan='7'>Dear Sir,</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td colspan='7'>As discussed I am sending you the quotation</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th height='20' colspan='7' align='left'></th>";
$table .= "</tr>";
$table .= "</thead>";
$table .= "</table>";
$table .= "<table border='1' width='100%'>";
$table .= "<tr>";
$table .= "<th>S.No.</th>";
$table .= "<th>Item Name</th>";
$table .= "<th>MRP</th>";
$table .= "<th>Selling Price</th>";
$table .= "<th>Quantity</th>";
$table .= "<th>Discount</th>";
$table .= "<th>Amount</th>";
$table .= "</tr>";
$table .= "<tbody>";
$i = 1;
$tot = 0;
foreach ($query as $k => $v) {
$tot = $tot + $v['amt'];
if ($v['discount'] == '') {
$discount = '0';
} else {
$discount = $v['discount'];
}
$table .= "<tr>"
. "<td align='center'>" . $i++ . "</td>"
. "<td align='left'>" . $v['name'] . "</td>"
. "<td align='center'>" . $v['MRP'] . "</td>"
. "<td align='center'>" . $v['selling_price'] . "</td>"
. "<td align='center'>" . $v['qty'] . "</td>"
. "<td align='center'>" . $discount . "%</td>"
. "<td align='right'>" . $v['amt'] . "</td>"
. "</tr>";
}
$table .= "<tr>";
$table .= "<td colspan='1'></td>";
$table .= "<td colspan='5' align='right'>TOTAL</td>";
$table .= "<td colspan='1' align='right'>" . $tt_amt . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td colspan='1'></td>";
$table .= "<td colspan='5' align='right'>DISCOUNT</td>";
$table .= "<td colspan='1' align='right'>" . $dis_amt . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td colspan='1'></td>";
$table .= "<td colspan='5' align='right'>SUB TOTAL</td>";
$table .= "<td colspan='1' align='right'>" . $sub_amt . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td colspan='1'></td>";
$table .= "<td colspan='5' align='right'>CGST</td>";
$table .= "<td colspan='1' align='right'>" . $cgst_amt . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td colspan='1'></td>";
$table .= "<td colspan='5' align='right'>SGST</td>";
$table .= "<td colspan='1' align='right'>" . $sgst_amt . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td colspan='1'></td>";
$table .= "<td colspan='5' align='right'>IGST</td>";
$table .= "<td colspan='1' align='right'>" . $igst_amt . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td colspan='1'></td>";
$table .= "<td colspan='5' align='right'>CESS</td>";
$table .= "<td colspan='1' align='right'>" . $cess_amt . "</td>";
$table .= "</tr>";
if(!empty($queryToGetOtherItems)){
foreach ($queryToGetOtherItems as $data) {
if ($data['discount_percent'] == '') {
$discount = '0';
} else {
$discount = $data['discount_percent'];
}
$table .= "<tr>"
. "<td colspan='1'></td>"
. "<td colspan='5' align='right'>" . $data['name'] . "</td>"
. "<td colspan='1' align='right'>" . $data['total_amount'] . "</td>"
. "</tr>";
}
}
$table .= "<tr>";
$table .= "<td colspan='1'></td>";
$table .= "<td colspan='5' align='right'>GRAND TOTAL</td>";
$table .= "<td colspan='1' align='right'>" . $tot_amt . "</td>";
$table .= "</tr>";
$table .= "</tbody>";
$table .= "</table>";
$table .= "<table width='100%'>";
$table .= "</tbody>";
$table .= "<tr>";
$table .= "<th height='60' colspan='7' align='left'></th>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td colspan='7' align='left'><strong>TERMS & CONDITIONS :</strong><br>" . $description . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td align='left' colspan='7'><strong>With Regards</strong><br><br><strong>Name :</strong> " . $ofc_detail['company_name'] . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td align='left' colspan='7'><strong>Mobile No</strong> :" . $ofc_detail['ofc_mob_one'] . "</td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<th height='60' colspan='7' align='left'></th>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td colspan='7'><center>Address : " . $ofc_detail['address'] . "</center></td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td colspan='7'><center>GST No : " . $ofc_detail['gst_number'] . "</center></td>";
$table .= "</tr>";
$table .= "<tr>";
$table .= "<td colspan='7'><center>E-Mail ID : " . $ofc_detail['ofc_email_one'] . "</center></td>";
$table .= "</tr>";
$table .= "</tbody>";
$table .= "</table>";
}
$file_name = "Quotation_" . $quotation_id . "_" . date('Y_m_d_his') . ".pdf";
$mpdf->WriteHTML($table);
$files = $_SERVER['DOCUMENT_ROOT'] . '/path/' . $file_name;
$content = $mpdf->Output($files, 'F');
To resolve the issue I've checked for the following this
Optimized the main query and was able to get response in just 0.26 to 0.30sec
but still not able to generate in less seconds.