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WordPress Performance: Time Consuming MySQL Queries and Caching

create a website — Sun, 24 Jan 2010 22:29:20 +0000

I have been looking at a client’s WordPress install the last few days. They have a large number of posts and page load times in general have been increasing. I installed some query logging based on the code in this article …
Rails-Like SQL Query Logging in WordPress

Checking over the logs it became obvious that queries using SQL_CALC_FOUND_ROWS are a problem. Digging through code it appears that where a limit on results is used it uses this query modifier to allow simpler coding of paging. The problem is that since the main query to grab blog posts on the blog home page or any archive page uses this, on a large blog this becomes quite inefficient.

For now I have tweaked MySQL so that the MySQL Query Cache is now larger. These articles were useful:
MySQL Query Cache (at MySQL Performance Blog)
Turn on MySQL query cache to speed up query performance?

Looking at the log after this change query times have dropped dramatically (from over 0.5 seconds and up to milliseconds). This has immediately improved performance of the blog and overall load on the server.

I am currently looking at some WP Caching API and plugins to further improve performance.

If you are looking for some more ways to speed up WordPress check out this article as a starting point:
4+1 Ways To Speed Up WordPress With Caching

And … for myself – just so I remember:
Install Memcache onto cPanel running CentOS

Quick Tip: Finding cPanel Logs

create a website — Mon, 21 Sep 2009 02:50:49 +0000

Need to find those FTP logs? Quick overview of the various log files typically available on a web server (with particular reference to cPanel) …

cPanel Logs – A detailed view

Re-running all website statistics in cpanel

create a website — Fri, 28 Mar 2008 23:22:59 +0000

Found this:

for i in `ls /var/cpanel/users`;do /scripts/runweblogs $i;done

here:
Executing /scripts/runweblogs for all users in cpanel

Also while on the subject of cpanel … if you are a bit of a server n00b like me … this restarts the cron service …

service crond restart

SPF records on a cPanel Server

create a website — Tue, 25 Mar 2008 06:52:04 +0000

Getting email delivered can be a problem without, among other things, an SPF (Sender Policy Framework) record.

Just found this:
how to install SPF records on a cPanel server

The whole site looks really useful.

Note to self: check back there and do some reading.