How to Optimize WordPress Performance with Caching Techniques
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WordPress is dynamic. To have a brilliantly fast and scalable site, you'll need some caching. This talk, given at WordCamp London 2015, will look at caching techniques in WordPress.
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How to Optimize WordPress Performance with Caching Techniques
- 6. Caching storing data for future use @markjaquith #wcldn
- 7. More Cache Fewer Problems @markjaquith #wcldn
- 11. WORK LESS OFTE N WORK LESS OFTEN $TTL = 5400; $TTL = 900; @markjaquith #wcldn
- 12. MAKE GENERIC OUTPUT @markjaquith #wcldn
- 13. Cache the whole page @markjaquith #wcldn
- 15. W3 Total Cache @markjaquith #wcldn
- 16. WP Super Cache @markjaquith #wcldn
- 17. Varnish or Nginx @markjaquith #wcldn
- 20. location ~ .php$ { } @markjaquith #wcldn
- 21. set $no_cache_set 0; set $no_cache_get 0; @markjaquith #wcldn
- 22. if ( $http_cookie ~* "comment_author_| wordpress_(?!test_cookie)|wp-postpass_" ) { set $no_cache_set 1; set $no_cache_get 1; } @markjaquith #wcldn
- 23. # X-Nginx-Cache-Purge: 1 # header will skip the cache! if ( $http_x_nginx_cache_purge ) { set $no_cache_get 1; } @markjaquith #wcldn
- 25. function nginx_purge_url( $url ) { wp_remote_get( $url, array( 'reject_unsafe_urls' => false, 'timeout' => 0.01, 'blocking' => false, 'headers' => array( 'X-Nginx-Cache-Purge' => '1' ) )); } @markjaquith #wcldn
- 26. add_action( 'transition_post_status', 'nginx_purge_post', 10, 3 ); function nginx_purge_post( $new, $old, $post ) { if ( 'publish' === $old || 'publish' === $new ) { nginx_purge_url( get_permalink( $post ) ); } } @markjaquith #wcldn
- 27. Variable cache lengths + Proactive cache refreshing @markjaquith #wcldn
- 28. add_action( 'template_redirect', 'cache_home_page_length ); function cache_home_page_length() { if ( ! is_user_logged_in() && is_home() ) { header( 'Cache-Control: public, max-age=300' ); } } @markjaquith #wcldn
- 29. Logged in = no page caching? @markjaquith #wcldn
- 31. How does the page vary? @markjaquith #wcldn
- 32. 1. Toolbar 2. Inline edit links 3. User's private posts 4. Moderated comments shown 5. Comment form @markjaquith #wcldn
- 33. Remove these things —OR— Make them generic @markjaquith #wcldn
- 36. Inline edit links GONE @markjaquith #wcldn
- 37. User's private posts GONE @markjaquith #wcldn
- 39. Compare: 10 editors and 1000 subscribers view 5 pages each @markjaquith #wcldn
- 40. Caching skipped for logged in users: 5,050 dynamic views @markjaquith #wcldn
- 41. Caching skipped for Editors and up only: 50 dynamic views 5000 cached views @markjaquith #wcldn
- 42. Less than 1% of the workload as before! @markjaquith #wcldn
- 43. What if the page really DOES need per user customization? e.g. "Howdy $username" @markjaquith #wcldn
- 44. 1. Load 2. Ajax if logged in 3. Customize @markjaquith #wcldn
- 46. 1. Set JS-readable cookies 2. Get rid of the normal ones 3. Populate the form with JavaScript @markjaquith #wcldn
- 53. W3 Total Cache + Batcache @markjaquith #wcldn
- 54. Using Transients and the Object Cache @markjaquith #wcldn
- 56. Transients use object caching, if available Otherwise, the options table @markjaquith #wcldn
- 57. The Object Cache API uses an object caching backend, if available Otherwise, in-process PHP memory @markjaquith #wcldn
- 58. Transient API set_transient( $key, $data, $ttl ) get_transient( $key ) @markjaquith #wcldn
- 59. Object Cache API wp_cache_get( $key, $group ) wp_cache_set( $key, $data, $group, $ttl ) @markjaquith #wcldn
- 60. Avoiding Cache Stampedes and Cold Caches @markjaquith #wcldn
- 61. $item = get_transient('footer_item'); if ( ! $item ) { // Some poor person has to WAIT $get = wp_remote_get( get_option( 'footer_url' ) ); if ( ! is_wp_error( $get ) ) { $item = wp_remote_retrieve_body( $get ); wp_set_transient( 'footer_item', $item, 300 ); } } echo $item; @markjaquith #wcldn
- 63. function fetch_footer_item() { $get = wp_remote_get( get_option( 'footer_url' ) ); if ( ! is_wp_error( $get ) ) { return wp_remote_retrieve_body( $get ); } else { return false; } } echo tlc_transient('footer_item') ->update_with('fetch_footer_item') ->expires_in(300) ->background_only() ->get(); @markjaquith #wcldn
- 65. $fragment = new CWS_Fragment_Cache( 'unique-key', 3600 ); if ( ! $fragment->output() ) { // START functions_that_do_stuff_live(); these_should_echo(); // END $fragment->store(); } @markjaquith #wcldn
- 67. Caching for speed — Caching for scale @markjaquith #wcldn
- 68. Less work — Generic output @markjaquith #wcldn
- 69. Cache the whole page @markjaquith #wcldn
- 70. Think Nginx and Varnish, not PHP caching solutions @markjaquith #wcldn
- 71. Check out my whacky new plugin github.com/markjaquith/cache-buddy @markjaquith #wcldn
- 72. Use Object Caching @markjaquith #wcldn
- 73. Leverage Transients (or maybe the Object Cache directly) @markjaquith #wcldn
- 74. Stampedes are bad @markjaquith #wcldn
- 76. Q A(if we have time, which we probably do not) & @markjaquith #wcldn