In the past, I used to managed a WordPress site on DigitalOcean droplet (One-click app) with 2 vCore, 4GB of memory, Ubuntu 16.04, Apache 2.4.18, and mysql community version 5.7.29.
Then the website was transferred to a droplet with 2 vCore, 4GB of memory, Ubuntu 18.04, Apache 2.4.29, and mysql community version 8.0.20.
Instantly after went live on the new droplet apache (“apache2 -k start” on htop) started to spike CPU to 30 and 40% and down to 0 to 3% and then after a few moments up again, and down again.
This is how the average graphs looks like (more or less): ||||___| the old server, it used to look like this -----------------.
Both were one-click WordPress servers from DigitalOcean with default settings. Also, in the old server, the CPU usage with the same and sometimes even more load was always a flat line of 3 to 6%.
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