I am not a php developer and I do not know how to configure the server, but I have such a problem. In the statistics of RAM and processor on my server, some slides are displayed (CPU https://disk.yandex.ru/i/BvtYfNCUGmAb1A and RAM https://disk.yandex.ru/i/WgSEYqJKU0gZFg).
There are 4 running applications on the server, 2 php and 2 js, and it has 8 Cores and 16 GB of RAM.