Why the sites on the VPS are loaded very slowly?

Good afternoon.
On a VDS there are about 40 sites. But more recently, they began to load very slowly.
In ssh the command free-m gives the following:
So that memory is enough, as I understand it.
What could be wrong? Where VDS need to watch to understand what to do?
Would be very grateful for an answer.
June 10th 19 at 14:28
4 answers
June 10th 19 at 14:30
It is impossible to answer the question without having full information.
It is unclear what kind of sites kind of load, whether they are cached, what kind of load they generate on the CPU and disk.
It is likely that the drive is very slow - rather than suffer the majority of VPS can and the CPU time is simply not enough, and maybe the bandwidth to the Internet is not enough.

Where VDS need to watch to understand what to do?
First you need to watch how much and what kind of resources you need to tap everything.
And then see what resources are not enough.

Well, still need to understand what virtual servers are in most cases going with oversells.
And the neighbor on the physical server running on your VM hard task may well dramatically reduce the performance of your VM.
June 10th 19 at 14:32
Usually due to CPU or settings.
Virtual hosting normal iron and the correct settings in most cases. Maybe you will not need a VPS.
June 10th 19 at 14:34
Obviously need to look top
June 10th 19 at 14:36
Little data for analysis. It would be nice to see at least:
- ps -aux
- df
- top
features VDS (memory, megahertz, cores, ...)
- what engines on the websites

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