How to clear user’s browser cache after publishing a new post?

There are kind of two levels to browsing caching: Browser is provided with explicit information when page expires via response headers or 304 Not Modified response. Browser kind of assumes that page was loaded very recently and is still good for a while. Respectively there are two possible things going wrong: Your server is replying … Read more

How does WP’s cache maintain persistence through page reloads?

The short answer is: it doesn’t That doesn’t mean it can’t be made persistent, and it doesn’t mean it doesn’t improve performance. Performance Gains Despite No Persistence Lets say we fetch 5 posts, and on each post we retrieve various post meta. You might think that each call to get_post_meta results in an additional DB … Read more

Is it duplicated if I cache an object that uses data from postmeta?

If the generation of the graphic presentation requires a lot of CPU time or memory, then yes, you could cache your graphic presentation (HTML I guess, right?). Perhaps in the database/memory, as a transient. Caching post meta data (that you use to generate the graphic) is not necessary, because WP already handles this. If you … Read more

Files cached as CSS or PHP?

A great deal of this will depend on your server configuration, but: Will WP Super Cache cache the css.php output? Extremely unlikely. If your file simply generates CSS from a few variables, then no. If however it bootstraps and loads WordPress, then it ‘might’ cache some things, but I doubt it will work as you … Read more

WebHostingBuzz cache statement

The point of caching is to increase performance, not specifically to reduce server load, but there is pretty obviously a relationship– perhaps not exactly the one(s) you expect. This is by no means a canonical answer but here are several things I can think of: Some kinds of caching increases memory usage. Caching that uses … Read more

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