So when you log into a host there are a few General things you should look for.
There are things you can do on the host to troubleshoot issues with your resources.
top -bn 3
(this should show you 3 iterations op the top command. And what is running also what resources are being used. )
iostat -xmd 1
(This will tell you if anything is writing/reading too much. Pay attention to the last column, if anything is over say 30% that’s high io.)
Next I would suggest using sar to find CPU usage, Memory, and Swap being used. We are going to 3 screens 2 seconds apart
This will show your cpu
sar – u 2 3
This will show cpu usage.
sar -r 2 3
This shows your memory usage.
sar -S 2 3
This reports the swap statistics.
You can also use sar to get historical records on your server with the -f option then the file path usually /var/log/sa.
Again for more details on this great tool see my article.
Between these 3 tools you should get a good feel for what your system is doing resource wise.