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WordPress digitalocean taking eternally to load

So, I’ve a WordPress droplet in Digitalocean with 4 shared vcpu and 8gb of ram. The whole lot was working actually positive till I get about 400 simultaneous entry within the web site, then it will get REALLY SLOW. However my ram and cpu are like 40%.

Now that I am posting this query, that there is 20, 40 individuals on-line it goes nicely. However when I’ve about 400 individuals, the web site masses actually sluggish – however reminiscence and CPU utilizing 40%.

Does anybody is aware of what may or not it’s and the way can I remedy it?

Can or not it’s an issue with my mysql settings? Or the rest?

My web site URL is: https://aulas.minhasplantas.com.br/

This is my terminal once I run prime:

And right here iotop