Somebody else's opinion, nobody?
Then look under section "2b. TASK and CPU States" to learn what those numbers mean. The following section explains your questions regarding memory.
Thanks, Daerandin! Or what about RTFM...
Line 2 shows CPU state percentages based on the interval since the last refresh.
As a default, percentages for these individual categories are displayed. Where two labels are shown below, those for more recent kernel
versions are shown first.
us, user : time running un-niced user processes
sy, system : time running kernel processes
ni, nice : time running niced user processes
id, idle : time spent in the kernel idle handler
wa, IO-wait : time waiting for I/O completion
hi : time spent servicing hardware interrupts
si : time spent servicing software interrupts
st : time stolen from this vm by the hypervisor
In the alternate cpu states display modes, beyond the first tasks/threads line, an abbreviated summary is shown consisting of these ele-
a b c d
%Cpu(s): 75.0/25.0 100[ ...
Where: a) is the combined us and ni percentage; b) is the sy percentage; c) is the total; and d) is one of two visual graphs