Performances

To optimize the performance of the Ultimate PHP PDF Generator Engine and ensure efficient operation, especially for complex or large document generation, we recommend following these configuration best practices based on TCPDF standards:

Server-Level & PHP Configuration:

• Implement Opcode Caching: For significant performance gains, install and configure a PHP opcode cacher such as XCache.

• Adjust Memory Limits: Increase the PHP memory_limit in your php.ini file to allow scripts sufficient memory for generation.

• Extend Execution Time: Increase the PHP max_execution_time in php.ini to prevent scripts from timing out during lengthy processes.

Engine-Specific Configuration (config/tcpdf_config.php):

• Manually Set Crucial Paths: Improve path resolution speed and reliability by manually defining the $_SERVER['DOCUMENT_ROOT'], K_PATH_MAIN, and K_PATH_URL constants in config/tcpdf_config.php. Remove the automatic calculation logic for these paths.

• Disable Unused Features:

  • If Thai language support is not required, set the K_THAI_TOPCHARS constant to false.

  • If your documents do not need extended characters, set the default fonts to core fonts for smaller file sizes.

  • If UTF-8 Unicode support is unnecessary, configure the TCPDF constructor by setting the $unicode parameter to false and the $encoding parameter to an alternative character map (e.g., 'ISO-8859-1').

Generation Best Practices:

• Manage Font Subsetting: While font subsetting reduces the size of embedded Unicode TTF fonts, it is a memory-intensive and slower process. If performance is critical, consider turning it off using the setFontSubsetting(false) method.

• Prioritize Core Fonts: Use standard core fonts instead of embedded fonts whenever possible to reduce processing time and file overhead.

• Optimize HTML Usage:

  • Avoid using complex HTML syntax (writeHTML and writeHTMLCell methods) unless absolutely necessary.

  • If you must use large blocks of HTML, split them into smaller, manageable pieces to optimize rendering.

• Avoid Unnecessary Transactions: Use database transactions only when strictly required during PDF generation to reduce system load.

Crucial Step: Always restart your web server (e.g., Apache, Nginx) after making any changes to php.ini or configuration files for the optimizations to take effect.