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Comment and term meta lazyloading for `WP_Query` loops, introduced in 4.4, depended on filter callback methods belonging to `WP_Query` objects. This meant storing `WP_Query` objects in the `$wp_filter` global (via `add_filter()`), requiring that PHP retain the objects in memory, even when the local variables would typically be expunged during normal garbage collection. In cases where a large number of `WP_Query` objects were instantiated on a single pageload, and/or where the contents of the `WP_Query` objects were quite large, serious performance issues could result. We skirt this problem by moving metadata lazyloading out of `WP_Query`. The new `WP_Metadata_Lazyloader` class acts as a lazyload queue. Query instances register items whose metadata should be lazyloaded - such as post terms, or comments - and a `WP_Metadata_Lazyloader` method will intercept comment and term meta requests to perform the cache priming. Since `WP_Metadata_Lazyloader` instances are far smaller than `WP_Query` (containing only object IDs), and clean up after themselves far better than the previous `WP_Query` methods (bp only running their callbacks a single time for a given set of queued objects), the resource use is decreased dramatically. See [36525] for an earlier step in this direction. Props lpawlik, stevegrunwell, boonebgorges. Fixes #35816. git-svn-id: https://develop.svn.wordpress.org/trunk@36566 602fd350-edb4-49c9-b593-d223f7449a82 |
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