PHP PDF generation becomes slow when creating large documents

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I am working on a PHP-based worksheet generation system and recently ran into a performance problem. The application generates printable PDF files based on user-selected options. The workflow is: User selects options ↓ Server generates data ↓ PHP creates PDF ↓ User downloads the file The problem is that the generation time increases significantly when the document contains many items. For example: 100+ exercises multiple pages answer pages custom layouts Current implementation The frontend sends a POST request to the PDF generation endpoint: $result = http_post( https://www.wativate.com/?api/p

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