askalan

Level 16
Verified
Malware Hunter
I think Windows Defender is the only good virus protection on Windows 10. But it's a bit different in terms of performance. That's where people and I argue.

Let's start with the fact that Defender has different speeds depending on what hardware you use. Defender is very hard disk heavy and if you only have a 5400 RPM hard disk, then the system becomes noticeably slower. But if you have an SSD (which is obligatory nowadays!), you don't really notice anything.

In this video it is said that Defender slows down the computer "only" 7%. However, this is only true for his computer (it is very likely that he has an SSD in it) and not for all of them.

Second, you should never evaluate the performance of a program/operating system in a VM. This didn't falsify so much in this test, but it would probably turn out differently on a real PC (by a few percent).
 

stefanos

Level 24
Verified
I think Windows Defender is the only good virus protection on Windows 10. But it's a bit different in terms of performance. That's where people and I argue.

Let's start with the fact that Defender has different speeds depending on what hardware you use. Defender is very hard disk heavy and if you only have a 5400 RPM hard disk, then the system becomes noticeably slower. But if you have an SSD (which is obligatory nowadays!), you don't really notice anything.

In this video it is said that Defender slows down the computer "only" 7%. However, this is only true for his computer (it is very likely that he has an SSD in it) and not for all of them.

Second, you should never evaluate the performance of a program/operating system in a VM. This didn't falsify so much in this test, but it would probably turn out differently on a real PC (by a few percent).
Agree with you
 

Windows_Security

Level 23
Verified
Trusted
Content Creator
I am writing this post on my Asus Transformer which has an Intel Atom Z3740 CPU running at 1,33 GHZ with 2 GB RAM and 32 GB SSD running on Windows 10 Home with
a) Software Security Policy (Run as Basic User, except for Admin)
b) Set UAC to deny elevation of unsigned
c) Disabled windows Windows Scripting and Powershell through WD exploit protection
d) Windows Defender tweaked with Configure Defender

Because of these simple non-intrusive security tweaks and the weak processor I have set WD to exclude scanning UAC protected folders. I have treid lot third party AV's, but there is no AV with less impactst on this (on the low end) of low end CPU's.

My wife's PC (Lenova 2in1 Yoga) with Pentium 4415U and 128GB SSD runs same setup (a,b,c) but with fully enabled WD (so covering all folders and protected folders feature also enabled. This Pentium is also running Windows 10 and it could be characterized as top end of the low end CPU's and impact of WD with everything enabled is really minimal.

So with my experience you need to tweak Windows Defender when running bottom end of low spec CPU's, but with a Pentium or higher you should be fine with WD as your security defense. IMO problems occur when adding third-party security. I agree that WD has it flaws, but with some simple tweaks (@Andy Ful configure defender, Documents Anti-Exploit, Hard Configurator) it is great protection with minimal system impact.

Maybe these positives experiences all are related to all of our systems having an SSD to run OS from. Even my Desktop (an old Pentium G3240) loads firefox in a sandbox within 1.5 secs cold and less than 0.5 sec consequetive warm starts. With ordinary harddisk cold start was between 4-5 secs, so best investment IMO for old systems is a SSD (60 GB or larger).
 
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Slyguy

Level 42
Verified
You don't need a benchmark video to see WD slowing down your machine, all this could've been avoided if the MS devs cared to implement scan-on-execution...
Totally.

I am surprised each time I reset a Windows 10 box and have WD running. Even the fastest gaming rigs feel like a boat anchor and I cannot disable that crap (GPEDIT) fast enough to bring the machines back to life.

I sort of feel bad for anyone using WD as a result. They're giving up a lot of performance for mediocre protection.
 
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shmu26

Level 82
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I found Windows Defender to slow down a virtual machine, but a physical machine with the OS running on SSD is generally quite fast and light with Windows Defender. This is true of system startup and shutdown, launching of programs, etc.But if you copy large amounts of data from one location to another, or you open a folder with a lot of executables in it, then Windows Defender underperforms.
 

Evjl's Rain

Level 43
Verified
Trusted
Content Creator
Malware Hunter
Just upgraded 3 PCs with SSDs and cleanly installed Windows 10 => WD really slows down everything in all machines, more noticeably during installation of essential programs. High CPU and disk activities, freezes
Benchmarking won't tell anything because it won't make WD slow you down but when you do some tasks, WD will kick in

many people say WD doesn't slow down anything (no tweak, no customization) mean they don't compare the difference between with and without WD, or they just tolerate it, or they just test it for a few minutes and conclude there is no slow down
 

SumTingWong

Level 22
Verified
You don't need a benchmark video to see WD slowing down your machine, all this could've been avoided if the MS devs cared to implement scan-on-execution...
But download malware files will not be scanned by Bitdefender. I definitely don't want them on my disk in freezing stage.
 

imuade

Level 9
Verified
I have set WD to exclude scanning UAC protected folders. I have treid lot third party AV's, but there is no AV with less impactst on this (on the low end) of low end CPU's.

[...]

So with my experience you need to tweak Windows Defender when running bottom end of low spec CPU's, but with a Pentium or higher you should be fine with WD as your security defense. IMO problems occur when adding third-party security. I agree that WD has it flaws, but with some simple tweaks (@Andy Ful configure defender, Documents Anti-Exploit, Hard Configurator) it is great protection with minimal system impact.
+1
 
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shmu26

Level 82
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Trusted
Content Creator
Just upgraded 3 PCs with SSDs and cleanly installed Windows 10 => WD really slows down everything in all machines, more noticeably during installation of essential programs.
Interesting. I don't spend much of my time installing programs, so I didn't even take that into consideration. So if I am going to install something massive, where time is a factor, like MS Office for instance, then I should disable WD.