fpdf2 #154

        // cross-reference
        $offset = $this->writer->getOffset();
        $this->put('xref');
        $this->putf('0 %d', $this->writer->getObjectNumber() + 1);
        $this->put('0000000000 65535 f ');
        for ($i = 1; $i <= $this->writer->getObjectNumber(); ++$i) {
This loop uses a function. To avoid the overhead of executing the function n times, you should precalculate it before the loop.
Time to fix: about 15 minutes
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                                    Last edited Wed, 18 Mar 2026 04:01:27 +0000 by Laurent Muller
                    
            $this->putf('%010d 00000 n ', $this->writer->getOffsets()[$i]);
        }
        // trailer
        $this->put('trailer');
        $this->put('<<');