WordPress is terribly slow. How to treat?

Question

CMS

Subject.

The admin panel barely moves, the pages of the site are loaded for quite a long time. Stands on a virtual platform in the masterhost. A couple of Joomla sites and a phpbb forum are spinning on the same site. They work perfectly, all actions are instant and the download speed is fast.

Of the heavy plugins, only nextgen gallery is worth it. The rest are small and non-resource intensive.

How to treat?

WP 3.4.1

Answer 1

Well, you can start by disabling the plugins in order and checking if it got better. There was also some kind of plugin that displayed the amount of devoured memory in the admin panel - quite useful.
Perhaps there is not enough memory for the process (that is, hosting restrictions). Here to treat only by moving or a more expensive tariff.
Perhaps caching will help (WP Super Cache \ MaxCache, etc.).

Answer 2

1. I would ask the hosting administrators to check and send me server load logs (including my site).
2. check the load on the database server - usually the hoster has one or more nodes, DDoS has come to someone, for example, the database server barely itches.
3. check the load on the xdo channel of the host with the site - try to upload a large file and merge it to yourself - it will be visible in terms of speed.
4. to optimize site scripts and plugins - look for profilers that show how much this or that element is generated.
5. check banner networks and other similar inserts

Answer 3

in fact, the theme can also load robustly, and in some cases WP itself can slow down, for example, when there are 1K pages and the permalink format is “wrong”.

Answer 4

a simple refactoring with xhproof will open your eyes.

Answer 5

WP SuperCache Plugin

Answer 6

Check out the materials:

• habrahabr.ru/post/132817/
• habrahabr.ru/post/57346/

Unfortunately, without access to the resource, it is very difficult to find the reason for the slow operation. It can be anything, for example, banner system brakes.
Look through the browser console what is the slowest for you. You might find the reason there.

Answer 7

Try to check the site, for example, with this service tools.pingdom.com/fpt/ , see what takes the longest to load and, as a result, optimize it. And, of course, caching. It is possible to enable gzip if not enabled (via .htaccess)…

Answer 8

Go through the Wordpress optimization checklist . Plus material on Habré .

Answer 9

100% correct answer: the WordPress admin panel polls all plugins, core and theme for updates upon login. This survey takes time. Either turn off automatic polling for updates, or find a slow place (long-responding plugin server, add-ons, themes, cores ...)