Troubleshooting long refresh times when updating/posting articles/pages
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I was recently hired to troubleshoot performance issues on my client’s web server. They are using WordPress installed via Plesk and updated to version 2.9.1 in December using the WordPress Automatic Upgrade plugin. Since then, performance on the Admin pages has been deteriorating. For example, merely clicking update on an open article/page after making no changes at all causes the admin site to lock up for 30-60 seconds or more while it loads. What’s weird is that performance on sites they didn’t upgrade and are still running the old version (2.3) is also suffering.
I checked and Pingback is already disabled on all the sites. I also tried temporarily disabling Ping-o-matic, but that didn’t help either. I also enabled slow query logging on the database, but nothing is popping up there, either. Rebooting the server didn’t help.
What else can I do to fix this problem?
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