Force 'permanent' post cache of shortcode results

Question

Backstory: I am generating posts from rss feeds adding additional content to the post using shortcodes.

Problem is that every time the page is refreshed the shortcodes fire and load new content. This is fine for users, but Googlebot is going to see too many big changes every time it visits the post --- subtle updates for a justified reason or signs of user activity/engagement is good, wholesale changes, not good for SEO.

Question(s): Control caching or Control shortcodes?

1) Ideally there would be some kind of scheduler to control the shortcodes - ie. once a month refresh etc.

2) I'm using WP Super Cache combined with Autoptimize & Speed Up Lazy Load which work well, but there is no apparent provision to cache the shortcode results.

Ideas? I understand this question is short on details, but need to start with what is possible.

thanks

Answer 1

You'd want to look up transients Here's a simple example of how you do it.

function showPosts (){
    $posts = get_transient ("my_rss_transient");
    If (!$posts){$posts=getPosts ();}
    /* do showing off stuff here */
}

function getPosts (){
    $posts = /* get posts here*/
    Set_transient ("my_rss_transient", $posts, MONTH_IN_SECONDS);
     return $posts
}

The transient should be saved for each month. Sorry for the bad formatting.

EDIT: I agree with mark in the comments. Look up his way of doing it rather than this.