To answer both questions, we need to do some simple reasoning.

Of all the values above, the most useful is ’20 simultaneous PHP processes’, in English ‘entry processes’.
When a new visitor enters www.youwebsite.com, a process starts, and ends when the page has fully loaded. So the length of the process depends on the loading time of your site, i.e. how fast it is.

20 simultaneous processes means that, for example, if your homepage takes 2 seconds to fully load, then if 20 people opened your site at exactly the same time, no one else could visit it for 2 seconds.

In reality, however, it is not possible that everybody click altogether at exactly the same time, so it is more useful to calculate how many visitors it is possible to have in a minute..

Here is the calculation:

• Loading time of the homepage = 2 seconds.
• Simultaneous PHP processes per second = (total number of processes / seconds) => 20/2 => 10
• Simultaneous processes per minute = (Total number of processes / seconds * 60 seconds) => 10 * 60 => 600

So if your homepage had a load time of 2 seconds, you would have 600 simultaneous PHP processes per minute, i.e. simultaneous visitors per minute.