Have lots of meta for posts, is it better to get at all at once or each individually

Assuming you’re retrieving the posts using a standard WP_Query in some manner, then the postmeta data is automatically retrieved for all the relevant posts and cached in memory. When you later call get_post_meta, the data is simply returned from here.

So honestly, it doesn’t make any significant difference which approach you take. The get_post_meta function isn’t making database calls unless the data isn’t in memory already.

If you’re making a WP_Query and have no need to cache the postmeta info, you can set the update_post_meta_cache argument in the query to false. Similarly, you can set the update_post_term_cache to false to prevent it from caching relevant terms from the taxonomy system as well. These can speed up a query for specific cases where you know that you don’t need the meta/terms in advance.

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