通过修改function文件来使WordPress网站加载速度更快

/**
 * WordPress 后台禁用Google Open Sans字体，加速网站
 */
add_filter( 'gettext_with_context', 'wpdx_disable_open_sans', 888, 4 );
function wpdx_disable_open_sans( $translations, $text, $context, $domain ) {
  if ( 'Open Sans font: on or off' == $context && 'on' == $text ) {
    $translations = 'off';
  }
  return $translations;
}

function get_ssl_avatar($avatar) {
   $avatar = preg_replace('/.*\/avatar\/(.*)\?s=([\d]+)&.*/','<img src="https://cdn.v2ex.co/gravatar/\?s=$2" class="avatar avatar-$2" height="$2" width="$2">',$avatar);
   return $avatar;
}
add_filter('get_avatar', 'get_ssl_avatar');

//强制jquery库文件底部载入
function ds_print_jquery_in_footer( &$scripts) {
    if ( ! is_admin() )
        $scripts->add_data( 'jquery', 'group', 1 );
}
add_action( 'wp_default_scripts', 'ds_print_jquery_in_footer' );

//去除加载的css和js后面的版本号
/** Remove Query strings from Static Resources. */
function _remove_script_version( $src ){
    $parts = explode( '?', $src );
    return $parts[0];
}
add_filter( 'script_loader_src', '_remove_script_version', 15, 1 );
add_filter( 'style_loader_src', '_remove_script_version', 15, 1 );
add_filter( 'pre_option_link_manager_enabled', '__return_true' );

//删除 wp_head 中无关紧要的代码
remove_action('wp_head', 'rsd_link');
remove_action('wp_head', 'wlwmanifest_link');
remove_action('wp_head', 'wp_generator');
remove_action('wp_head', 'start_post_rel_link');
remove_action('wp_head', 'index_rel_link');
remove_action('wp_head', 'adjacent_posts_rel_link');

/* 禁用 Emoji 功能 */
remove_action('admin_print_scripts',    'print_emoji_detection_script');
remove_action('admin_print_styles', 'print_emoji_styles');

#remove_action('wp_head',       'print_emoji_detection_script', 7);
remove_action('wp_print_styles',    'print_emoji_styles');

remove_action('embed_head',     'print_emoji_detection_script');

remove_filter('the_content_feed',   'wp_staticize_emoji');
remove_filter('comment_text_rss',   'wp_staticize_emoji');
remove_filter('wp_mail',        'wp_staticize_emoji_for_email');

remove_action('rest_api_init', 'wp_oembed_register_route');
remove_filter('rest_pre_serve_request', '_oembed_rest_pre_serve_request', 10, 4);

remove_filter('oembed_dataparse', 'wp_filter_oembed_result', 10 );
remove_filter('oembed_response_data',   'get_oembed_response_data_rich',  10, 4);

remove_action('wp_head', 'wp_oembed_add_discovery_links');
remove_action('wp_head', 'wp_oembed_add_host_js');

// 关闭 XML-RPC 功能 
 add_filter('xmlrpc_enabled', '__return_false');

// 屏蔽 REST API
add_filter('rest_enabled', '__return_false');
add_filter('rest_jsonp_enabled', '__return_false');

//移除头部 wp-json 标签和 HTTP header 中的 link 
remove_action('wp_head', 'rest_output_link_wp_head', 10 );
remove_action('template_redirect', 'rest_output_link_header', 11 );

// Disable auto-embeds for WordPress >= v3.5
remove_filter( 'the_content', array( $GLOBALS['wp_embed'], 'autoembed' ), 8 );


add_filter('automatic_updater_disabled', '__return_true');  // 彻底关闭自动更新

remove_action('init', 'wp_schedule_update_checks'); // 关闭更新检查定时作业
wp_clear_scheduled_hook('wp_version_check');            // 移除已有的版本检查定时作业
wp_clear_scheduled_hook('wp_update_plugins');       // 移除已有的插件更新定时作业
wp_clear_scheduled_hook('wp_update_themes');            // 移除已有的主题更新定时作业
wp_clear_scheduled_hook('wp_maybe_auto_update');        // 移除已有的自动更新定时作业

remove_action( 'admin_init', '_maybe_update_core' );        // 移除后台内核更新检查

remove_action( 'load-plugins.php', 'wp_update_plugins' );   // 移除后台插件更新检查
remove_action( 'load-update.php', 'wp_update_plugins' );
remove_action( 'load-update-core.php', 'wp_update_plugins' );
remove_action( 'admin_init', '_maybe_update_plugins' );

remove_action( 'load-themes.php', 'wp_update_themes' );     // 移除后台主题更新检查
remove_action( 'load-update.php', 'wp_update_themes' );
remove_action( 'load-update-core.php', 'wp_update_themes' );
remove_action( 'admin_init', '_maybe_update_themes' );