MAC MINi Use More CPU - More RAM ?

My Mac Mini 2012 Server i7 2.6 2tb has just had its RAM upgraded from 4gb to 16gb . When doing a simple task like downloading and installing all my Apps
it uses , according to Activity Monitor , only 4 - 7 % of CPU and 4gb or less of RAM . Consequently it is taking hours and hours to complete this  simple task .
Internet is not brilliant but not too slow either .
Is there something ' holding back ' the Mini ? Is there a setting that I can tweak ? I assumed it would fly through simple tasks like this.
Also , when put to sleep , the white display light powers on and off for a few minutes but then goes solid white again giving the impression of being on and when I return to screen sharing the login page is visible . Does this mean that it is not staying in ' Sleep Mode ' ??
Apologies for Noob Questions
~M~ 

First the downloads, open Safari and go to the following
website:
http://www.speedtest.net
and run an internet speed test.  Then do the math to figure
how long a download should "ideally" take.  Remember that
there is more to download speeds than just the raw data
rate.  Server loading, the type of network you are on and
its activity can contribute greatly to large file down loads.
RAM and CPU have little to no impact when it comes to
downloading data over the internet, unless of course there
is a background task hogging CPU, which it does not seem
in your case. 

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