Where can you find an application that comprises a single shell command wrapped in so many layers that it ends up 10,000 times bigger, slower, more obtrusive, less intuitive and full of junk, but still performs the same function as the original command?
AppleScript can be handy sometimes, but when people release applications like this, and get awards for it, alarm bells should be going off. WallSaver is almost two megabytes in size. For a single command-line.
Just reinforce the point, I wrote another wrapper for the same command in Objective-C. It’s 100 kb, or 60 kb without the icon. It can pause the screensaver (which brings it down to 0 CPU usage), resume it or restart it. And not once will it throw an “AppleScript error” 
. Download it and see for yourself.
As for the source code, all you need is:
/System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine -background
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