I am using a HP dual core computer with 1917 ram and a 2.3 ghz possessor (amd). Anyway my computer used to jump to 100% usage for no reason, and freaked me out!!! So I went online and found this which so far has made my computer only use 60- 65% capacity while running viewer2.
Bring up Windows Task Manager with:
Windows XP: Ctrl-Alt-Del
Windows Vista: Ctrl-Shift-Esc
Windows 7: Ctrl-Shift-Esc
Click the Processes tab and select your viewer you are using
Right click it and select “Set Affinity”.
Select only one of the available cores, to begin with.
You will need to experiment at this point; there is no guide as to which core will work better for you. You may also be able to select more than one.
Also, the downside of this is that it will have to be done every time you run the viewer.
So far this has helped in a big way for me this is on windows btw.