@Dimec

In order to diagnose the issue, we’d really need to know more about your server.

Please provide:

• Run uname -a and post the output – feel free to comment out the hostname.
• Complete List of Packages Installed (by you - i.e. NGINX, PHP-FPM etc)
• Run top, press shift+m and finally, press c. Take a screenshot and post the URI.

–

What this will provide us with is, first and foremost, a look at what all you’re running (by looking at the package list), the top processes consuming the most RAM & CPU, and some basic OS information.

From looking at the output of free -m, of your 1GB, you’re physically using 670MB (the used column includes cache, so for actual usage you’d subtract the cache column from usage) and have 156MB free, so something is definitely using the RAM, but your SWAP looks fine (you’re not tearing through RAM, forcing SWAP usage which would almost immediately begin to affect CPU load).

That said, it is possible that you’re running out of RAM from time to time, which would force SWAP usage to prevent a crash (whether it’s MySQL, NGINX or something else). Once you begin to use swap, which spurs disk activity, you begin to utilize more CPU as disk (regardless of whether it’s an SSD, SATA, SCSI/SAS or Flash drive) is always going to be slower than RAM and accessing it will also always be more “expensive” in terms of CPU “cost.”