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CPU And Game Benchmarks

Do Virus Scanners Slow Down Your System?
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We should preface the following CPU and game benchmarks by saying we really don't expect security software to have an effect on them. Anti-virus software typically activates on the creation, opening, closing, or emailing of files, and none of the following tasks are focused on any of these activities. Regardless, we make no assumptions and perform the following tests to check our theory.

We start things off with a synthetic CPU benchmark to see whether or not these products will cause performance differences compared to a computer without any security software installed. As you can see, the presence of this software appears to cause no tangible impact on raw processing performance.

Now let’s see what happens in a real-world encoding application.

Encoding a video with the Xvid codec definitely stresses the processor—in fact, it stresses the whole platform. Nevertheless, there’s no real performance difference to see here.

We benchmarked Crysis to see if any of these security software products would affect game performance. Happily, it does not appear to have any impact whatsoever.

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Top Comments
  • 38 Hide
    Hupiscratch , November 30, 2010 6:44 AM
    I think Microsoft Security Essentials should be included if possible and there is a situation that I think it is greatly affected by anti-virus software: Windows start-up.
  • 32 Hide
    aznshinobi , November 30, 2010 5:48 AM
    Avast please?
  • 24 Hide
    iam2thecrowe , November 30, 2010 5:31 AM
    before i read the article, my guess is Norton is the slowest and most useless....
Other Comments
  • 5 Hide
    theshonen8899 , November 30, 2010 5:30 AM
    Great article, thanks!
  • 24 Hide
    iam2thecrowe , November 30, 2010 5:31 AM
    before i read the article, my guess is Norton is the slowest and most useless....
  • 24 Hide
    tony singh , November 30, 2010 5:41 AM
    How can u forget Avira , it's so popular & so good .
  • -3 Hide
    alyoshka , November 30, 2010 5:43 AM
    I guess the new ones are lighter than the earlier ones for some of them....
  • 4 Hide
    ruffopurititiwang , November 30, 2010 5:45 AM
    This is the kind of article that keeps me coming back to Tom's! Kudos!
  • 32 Hide
    aznshinobi , November 30, 2010 5:48 AM
    Avast please?
  • 4 Hide
    micr0be , November 30, 2010 5:49 AM
    talk about heavy modifications on the new set of AVs compared to the older ones ... my surprise is norton which i was expecting to cripple the system to a halt .... very nice article btw
  • 2 Hide
    tony singh , November 30, 2010 6:00 AM
    @Fip - Because when dirty viruses do their job, you'll get a headache.
  • 13 Hide
    iam2thecrowe , November 30, 2010 6:05 AM
    iam2thecrowebefore i read the article, my guess is Norton is the slowest and most useless....

    well i am really surprised
  • 2 Hide
    takeapieandrun , November 30, 2010 6:24 AM
    iam2thecrowewell i am really surprised

    I get Norton Security Suite free with Comcast. I was kind of bummed when I found out that's all they have available, but so far its been good to me. I haven't noticed any adverse effects, maybe startup is s little slower.
  • 24 Hide
    apache_lives , November 30, 2010 6:31 AM
    this is tested on a fresh install - the average system has a ~2 year old install and fragmentation and lower end hdd's, combind with a crapload of other software trying to startup - no really a real world benchmark.
  • 9 Hide
    Anonymous , November 30, 2010 6:31 AM
    it would have been useful to see a difference in the benchmarks using different HDDs like the 5400 RPM laptop ones, 7200 RPM and SSDs, that would have made a difference
  • 4 Hide
    Anonymous , November 30, 2010 6:43 AM
    Well the biggest slowdown you will experience with antivirus software is when you open a folder full of exe files and explorer tries to show all the icons of the executables. There is a very noticeable slowdown in that case.
    Also i would have liked a startup benchmark, because the antivirus also slowdowns somewhat the startup process.
  • 38 Hide
    Hupiscratch , November 30, 2010 6:44 AM
    I think Microsoft Security Essentials should be included if possible and there is a situation that I think it is greatly affected by anti-virus software: Windows start-up.
  • 5 Hide
    cjl , November 30, 2010 6:58 AM
    iam2thecrowewell i am really surprised

    Norton has VASTLY improved compared to what it used to be. I use Norton 360, and I have to say that it has been a great product.
  • -7 Hide
    Anonymous , November 30, 2010 7:04 AM
    2 ddragoonss
    thanks,
    AV is far from 100% protection, and could bring new problems (recently ESET NOD Smart Security causes problem with internet connection due to connection inspection / filtering ... ) For IT Pro is risk to get a virus very low, and if get one - few hours to get it out is worh instead of years of boring my pc with AV software
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