I use W3 Total Cache as well, so I double checked on my site to see what headers are being sent … and images are not sending anything that varies on User Agent. An example image response header: HTTP/1.1 200 OK Server: nginx Date: Tue, 27 Mar 2012 15:48:18 GMT Content-Type: image/png Transfer-Encoding: chunked Connection: … Read more
The crude alternative most people resort to is the one where you add a file and include several levels up. This is arguably worse for performance if not just as bad. But there is a variant that works better, if we create our own AJAX entrypoint URL, and specify: define( ‘SHORTINIT’,true); Then include the WordPress … Read more
I am not completely sure what you are talking about so I will mention the possibilities that come to mind. Maybe this… // Keep track of the last query for debug.. $this->last_query = $query; http://core.trac.wordpress.org/browser/tags/3.5.2/wp-includes/wp-db.php#L1195 … is what you are talking about. If so, your code just runs the flush method which resets $wpdb properties … Read more
I think there’s no really huge difference, you choose the tool that you feel most comfortable yourself. Plugins have the drawbacks you mentioned, and doing them from scratch can be a bit slow and tedious. The 3rd alternative, that I find really good, is a PHP class that does all the heavy lifting for you, … Read more
There’s an amazing plugin (as usual) called Query Monitor that will give you an amazing set of stats about all the queries run on a page load. You can see how many queries are made, by which components, how long they take – pretty much everything. I wouldn’t necessarily run this on a live site … Read more
In the case where you want to store each piece of data as a unique entry (row) in the database, then a custom table, as you’ve already done, is a perfectly fine solution. On the other hand… You could use the usermeta table to do the exact same thing, storing multiple meta keys with the … Read more
It depends on what you need. The software environment is the same you need for every other PHP site where you want to get an efficient workflow: up-to-date PHP (currently 5.5, so you can use Opcache) with at least 128 MB memory limit the same for MySQL web server with a rewrite engine regular backups … Read more
I’ve already fixed it. I simply had to go to WPML > Languages, and uncheck “Adjust IDs for multilingual functionality” which dramatically increased the performance of the translated version of the website, and I no longer get a PHP notice.
According to user Otto, who provides a good explanatory answer to a similar question, you can safely call wp_get_post_terms() a number of times because WordPress’s internal query caching system is primed before the loop begins, and subsequent calls to wp_get_post_terms() will hit the cache rather than the query: Post meta information is automatically cached in … Read more
The basic technique of logging queries is that if SAVEQUERIES constant is defined to be true (it’s not by default for performance reasons) then $wpdb->queries will keep the log of queries performed. There isn’t anything on top of this that WordPress natively does. There are plenty of plugins around which work either by interpreting this … Read more