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Making WordPress faster and greener By David Hilditch

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How much energy does WordPress use? How to calculate? ● Percentage of websites using WordPress? ● Percentage of traffic hitting WordPress websites? ● Average price of hosting paid by WordPress websites?

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WordPress hosting figures ● WordPress boasts about 35% of all websites ● 455 million WordPress websites ● Total hosting worth $77.5 billion per month ● $4 per site per month average for wordpress hosting ● WordPress about $2 billion per month worldwide ○ So about 2.6% of website traffic hits WordPress websites ● Websites use about 5% of electricity worldwide

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Types of inefficiencies in the WordPress ecosystem Running code when not required Excessive options size and misuse of autoload Table Scans & WP_Query abuse Cache busting

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Running code when not required ● Contact Forms 7 ● Popup Builder ● Mailjet ● Mailchimp ● Most plugins!

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Excessive options size and misuse of autoload ● MBs of data loaded on every page ● MBs of data updated on every page

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Table Scans & WP_Query abuse ● Table or index scans cause all your data to be read ● WP_Query with LIMIT 1 often used to check for existence of data ○ But they forget to remove the ‘orderby’ clause!

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Cache busting ● Page caching is great ● But not if you can’t use it ● Commonly your uncached users are your most valuable ones ○ And they get a slow experience! ● If a WordPress plugin generates user-specific HTML, the solution is commonly to avoid page caching for those cases ○ That’s not good enough!

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What can developers do to improve performance? ● Avoid table scans - test plugins at scale ● Avoid loading all data and processing it with PHP ● Avoid massive objects in wp_options ● Remove the sort order from WP_Query when not needed ● Learn how to use the object cache to store fragments from page to page ● Avoid cache busting - use Ajax for user-specific content ● Don’t run your code on pages where your code is not needed! ● Help me build an open source scalability test rig for WordPress

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What can you do today to improve performance? ● Learn how to use Query Monitor ○ Long running queries ○ Hundreds or thousands of queries ○ Queries that retrieve thousands of rows ○ Excessive RAM usage ● Run Asset Cleanup Pro ○ Disable unused plugins per page ● Use an object cache ○ Prefer plugins which make good use of the object cache

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How to get in touch Twitter: @davehilditch Facebook: davehilditch Github: dhilditch Website: www.wpintense.com Discord Server: Link on my website