Antivirus software slowing your computer

Is new Antivirus software slowing your computers?

Antivirus software is notorious for slowing down computers to the point where, without even thinking about it, it’s the first thing that I remove when I get a new system with, you know, McAfee or Norton pre-installed on it, but while anti-malware apps have grown in sophistication, along with the nefarious programs they’re intended to fight, modern computers are also a lot faster.

So then, is running antivirus in the background still like driving around with the handbrake on? To understand why security software would have any effect on system speed, we need a little bit of background.

Antivirus programs primarily focused on garden variety bad guys, like viruses, worms, trojans, and key loggers. And they would run constantly in the background so that nothing could slip through, sapping precious system resources that could have been used to render Lara Croft’s, tank top in more detail.

But because antivirus focused more on a specific set of known threats, they could miss some newer malware. Kind of like that famous attention experiment with the gorilla. That is where antimalware programs came in. They were designed to do periodic deeper scans of the entire system looking for patterns of behavior, or for symptoms that might indicate an infection, rather than a specific identifiable nefarious program.

These deep background scans, obviously take up some CPU usage, and especially in the days of mechanical hard drives, would cause your disc to thrash around, reducing system responsiveness while they were running. Making matters worse, most good anti-malware suites, included antivirus features, like real-time threat monitoring, and downloaded file scanning, so that’s like a textbook triple resource-hogging whammy.

On top of that, as the types and numbers of malware expanded, so did the databases of known threats, so it took more and more time and resources to check through a list that was growing longer than a CVS receipt.

That is why PCs were slowed down by security applications in the past, but how bad is it today? To find out we ran some tests, choosing a few common security apps, and without protection. You know, as a control. Our test setup was designed to be representative of a high-performance gaming rig, but one from a few years ago, and we ran it with, and without Windows security, the built-in protection that as far as we know has a fairly minimal performance impact.

We also used two of the most dread-inducing anti-malware to ever haunt the prebuilt and laptops of PC enthusiasts; McAfee, and Norton. We focused on mundane everyday activities. You know, how long it takes to download, install, and launch an app. Unzipping, transferring files, and booting windows.

That sort of thing, We also ran a handful of more enthusiast performance benchmarks, and there are actually a few surprising findings in our results. First up, is that a modern quad-core CPU should be enough to handle basic background scanning.

Our gaming tests were pretty much a wash, and our worst outlier in Cinebench, compared to our control was McAfee, with only about a three percent performance difference. Here is what blew my mind though. Even with a PCI Express and DM SSD, workloads that hit both CPU and storage were almost across the board slower with anti-malware running than without, and both Norton and McAfee had measurably higher performance impacts, compared to Windows Defender.

Unzipping a file took 35% longer with Norton installed on the system, compared to our baseline, and launching Adobe Premiere Pro, was anywhere from 5 to 30%slower with Windows Defender, and 25 to 35% slower with McAfee and Norton, compared to nothing at all. Nothing at all, nothing at all. Lttstore.com. Granted, in most cases, this equated to just a few seconds, but percentage-wise its just way more than I expected to the point where I think there is still a strong justification for the outrage about system builders bundling the software, especially on entry-level machines.

I mean even places where I didn’t expect it to the matter at all with a file transfer speed test, we ended up seeing a shocking impact. All of our anti-malware were within a few seconds of our control when we were transferring one-gigabyte file to a server on our local network.

But remember, that’s a scenario where the bottleneck is our ethernet connection. When transferring to a local SSD, the difference was eight seconds with Norton and over 12 seconds with McAfeerunning in the background.

Actual In fairness though, this is a lot better than things used to be, where a scan would start in the background and you would literally go and make some tea or something while you wait for a game to fire up.

So, how have we gotten here? Well first off, as I mentioned, PCs have gotten exponentially more capable then they were when I was a kid, and tasks that used to take up a significant portion of the CPUs power, now take a fraction of a percent. Second, remember those big malware databases we were talking about?

Well, they used to be hosted locally, on your PC, but now anti-malware companies host them in the cloud, where servers can take some of the processing giving your personal computer some sweet sweet relief. Mitigating some more of the performance sucking effects, the first time that I launched an app, or downloaded a file, or did whatever, it actually took longer than subsequent tests.

This makes sense since once that app or that process has been scanned, the security software knows that it’s probably still safe the next time that you launch it. And it’s nice that this feature worked because even if there is a performance impact initially, at least it doesn’t carry on scanning the same thing, slowing down every task, every single time.

So in conclusion then, we’re not saying; “Hey, go bareback, it’s great, you’re gonna love it protection is important, especially for people who engage in high-risk behavior online. I am just saying that this blog has definitely inspired us to be more cognizant of our background tasks, because even ones that I have generally come to accept as just part of the package, like Windows Defender, could be a digital boat anchor on your PCs performance.

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4 thoughts on “Antivirus software slowing your computer

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