by 
The Curious Bag
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<h4 class="dechead">On One Hand: A Standard Problem
All antivirus and spyware-scanning programs actively use your computer's memory to scan files and folders in an effort to recognize threats. The result is a hit in speed. On higher-end computers, you might not even notice the loss of memory; on older models, processes can slow to a crawl.
On the Other: You Aren't Using It Anyway
Avast screen-saver overlay is unique in that it takes advantage of the times during which a computer in not in use to actively scan for malware. Under the appropriate configuration, it runs only when your screen saver is up, which means you won't be using your computer to notice any decrease in speed.
Bottom Line
Users highly recommend Avast screen-saver because it runs quietly behind the scenes and only works when you're busy doing something else. If you're worried about slowing your computer down but still want protection from malware, Avast will achieve this goal with minimal negative side effects.
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