Maintaining the website

Keeping the website up to date improves performance by fixing bugs.

Modules

• Keep modules up to date. This fixes security issues and fixes bugs
• Reduce number of modules i.e. try to keep only key modules and remove those that perform a single task that can be done by a different design

Views

• Views can give negative impact in your site performance because of complex join queries.
• Enable views caching on pages or blocks that don’t need to be updated in real time.
• Simplify views e.g. by improving content type structures.
• Remove utf8_decode from data export because it significantly slows down exports.

Errors

• Resolve error logs. Pantheon provides developers direct access to numerous resources for debugging site execution problems, including slow site performance and PHP errors.
• Debugging sites with log files, including how to retrieve them → https://pantheon.io/docs/logs/
• Debugging slow performance → https://pantheon.io/docs/debug-slow-performance/
• PHP errors and exceptions → https://pantheon.io/docs/php-errors/
• Pantheon server errors and responses → https://pantheon.io/docs/errors-and-server-responses/
• New Relic → profiles and tracks application performance over time – https://pantheon.io/docs/new-relic-analysis/
• Perform site audit: https://pantheon.io/docs/drupal-launch-check/#troubleshooting

Database design

• Make sure all tables are in InnoDB format and not MyISAM: https://pantheon.io/docs/myisam-to-innodb/
• Keep PHP version up to date: https://www.pantheon.io/docs/php-versions/
• Database 4 byte UTF-8 support: https://www.drupal.org/node/2754539

• Drupal core updates
• Pantheon updates
• Contributed modules updates review
• Check views
• Check rules