my website works fine the day; load average below 3 and cpu below 50%.
but at night load average 18 and cpu 81% and the website become very very slow.
Photos are showing the active visitors at night 734 and 219 the day
the last photo shows the daily visitors from statecounter.com and i don't think that those numbers are true, i think my visitors are between 20000 and 30000.
i don't think the number of visitors is the problem.
i'm on a dedicated server:
- CPU: Intel(R) Xeon(R) CPU E3-1245 V2 @ 3.40GHz
- RAM: 31.32 Go
- Disk: 2x 2 To SATA
- Version PHP 5.3.3 mod FastCGI
- MySQL 5.1.73
- ionCube PHP Loader installed
Plugins used 17:
- All In One SEO Pack
- Attachment Pages Redirect
- Disqus Comment System
- iThemes Security
- Post Tabs
- Contact Form 7
- No Image Link
- Responsive Lightbox
- User Role Editor
- WordPress Related Posts
- Wp Pagenavi Style
- WP Smush.it
- WP Super Cache
i do always update wordpress and plugins
i tried everything, disabling all plugins one by one, deleting them all, changing themes, installing wordpress again and again, moving from host to host but still the same problem. I contacted the host but they still don't find the problem.
i think it's a small problem in the server configuration that makes all these troubles.