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Performance Test October 2015

Date October 2015
Language English
Last Revision November 6th 2015

Impact of Security Software on System Performance

Release date 2015-11-09
Revision date 2015-11-06
Test Period October 2015
Online with cloud connectivity checkbox-checked
Update allowed checkbox-checked
False Alarm Test included checkbox-unchecked
Platform/OS Microsoft Windows
Methodology Click here


The Performance Test evaluates the impact of anti-virus software on system performance, as programs running in background – such as real time protection antivirus software – use some percentage of system resources. Taking these tests as reference, users can evaluate their anti-virus protection in terms of system speed (system performance).

For further details please refer to the methodology documents as well as the information provided on our website.

Please note: We want to make clear that the results in this report are intended only to give an indication of the impact on system performance (mainly by the real-time/on-access components) of the security prod-ucts in these specific tests. Users are encouraged to try out the software on their own PC’s and see how it performs on their own systems.

The following up-to-date products available at time of testing for 64-bit systems were evaluated with default settings in this test. Although Baidu is a participant in our public main-test series, its International/English Antivirus product available at the time of testing was not compatible with Windows 10, and so was not included in the test. Additionally, Microsoft Windows Defender integrated in Windows 10 has also been evaluated.

Tested Products

Test Procedure

For the benefit of readers who are familiar with performance tests done in previous years, we should point out that this test includes both “Antivirus” and “Internet Security” products – both referred to as security products. We have tested the product that each manufacturer submits for the protection tests in the Main Test Series. Please note that the results in this report apply only to the specific product versions listed above (i.e. to the exact version numbers and to 64-bit systems). Also, keep in mind that different vendors offer different (and differing numbers of) features in their products.

The following activities/tests were performed under an up-to-date Windows 10 Home 64-Bit system:

  • File copying
  • Archiving / unarchiving
  • Installing / uninstalling applications
  • Launching applications
  • Downloading files
  • PC Mark 8 Professional Testing Suite

The tests were performed on an HP 350 G1 machine with an Intel Core i5-4210U CPU, 4GB of RAM and SATA II hard disks. The performance tests were done on a clean Windows 10 Home 64-Bit system (English) and then with the installed security software (with default settings). The tests were done with an active Internet connection to allow for the real-world impact of cloud services/features.

The hard disks were defragmented before starting the various tests, and care was taken to minimize other factors that could influence the measurements and/or comparability of the systems. Optimizing processes/fingerprinting used by the products were also considered – this means that the results rep-resent the impact on a system which has already been operated by the user for a while. The tests were repeated several times (with and without fingerprinting) in order to get mean values and filter out measurement errors. After each run, the workstation was defragmented and rebooted six times. We simulated various file operations that a computer user would execute: copying4 different types of clean files from one place to another, archiving and unarchiving files, downloading files from the Internet and launching applications (opening documents). For the subtests, we have this year re-placed WinAutomation with an industry-recognized performance assessment tool, namely Windows Assessment and Deployment Toolkit (Windows ADK) 6.3.9600.17029 with the Windows Performance Toolkit (WPT). This toolkit is widely used in the industry to measure the performance of computer systems. By using this tool, we enable vendors to more easily replicate the results and find out what in the product causes the impact on performance. In order to prevent vendors optimising their prod-ucts for our test, we have implemented our own test drivers for the ADK. These also enable us to measure the performance impact of individual sub-tests without these influencing each other.

We also used a third-party, industry-recognized performance testing suite (PC Mark 8 Professional) to measure the system impact during real-world product usage. Readers are invited to evaluate the vari-ous products themselves, to see what impact they have on their systems (due to e.g. software con-flicts and/or user preferences, as well as different system configurations that may lead to varying results).

Security products need to load on systems at an early stage to provide security from the very begin-ning – this load has some impact on the time needed for a system to start up. Measuring boot times accurately is challenging. The most significant issue is to define exactly when the system is fully started, as many operating environments may continue to perform start-up activities for some time after the system appears responsive to the user. It is also important to consider when the protection provided by the security solution being tested is fully active, as this could be a useful measure of boot completion as far as the security solution is concerned. Some security products load their ser-vices very late at boot (or even minutes later). Users may notice that some time after the system has loaded, it will become very slow for a little while; thus, it initially looks as though the system has loaded very quickly, but in fact the security product just loads its services belatedly, leaving the sys-tem more vulnerable. As we find this misleading, we still do not publish boot times in our reports.


File copying: Some anti-virus products ignore some types of files by design/default (e.g. based on their file extensions), or use fingerprinting technologies, which may skip already scanned files in order to increase the speed (see comments on page 6). We copied a set of various common file types from one physical hard disk to another physical hard disk.

Archiving and unarchiving: Archives are commonly used for file storage, and the impact of anti-virus software on the time taken to create new archives or to unarchive files from existing archives may be of interest for most users. We archived a set of different file types that are commonly found on home and office workstations. The results already consider the fingerprinting/optimization technologies of the anti-virus products, as most users usually make archives of files they have on their disk.

Installing/uninstalling applications: We installed several popular applications with the silent install mode, then uninstalled them and measured how long it took. We did not consider fingerprinting, be-cause usually an application is installed only once.

Launching applications: Microsoft Office (Word, Excel, PowerPoint) and PDF documents are very common. We opened and then later closed various documents in Microsoft Office and in Adobe Acro-bat Reader. The time taken for the viewer or editor application to launch, and afterwards to close, was measured. Although we list the results for the first opening and the subsequent openings, we consider the subsequent openings more important, as normally this operation is done several times by users, and optimization of the anti-virus products take place, minimizing their impact on the systems.

Downloading files: Large files are downloaded from a local server with a GUI-less browser that allows sending HTTP requests in the background. Additionally, the content of several popular websites are fetched via wget, also from a local server.

Ranking System

The testers defined the categories Mediocre, Fast and Very Fast by consulting statistical methods and taking into consideration what would be noticed from the user’s perspective, or compared to the impact of the other security products. If some products are faster/slower than others in a single subtest, this is reflected in the results.

Very Fast
The mean value of the products in this cluster builds a clearly slower fourth cluster in the given subcategory
The mean value of the products in this cluster builds a third cluster in the given subcategory
The mean value of the products in this group is higher than the average of all scores in the given subcategory
The mean value of the products in this group is lower than the average of all scores in the given subcategory

Test Results

These specific test results show the impact on system performance that a security product has, com-pared to the other tested security products. The reported data just gives an indication and is not nec-essarily applicable in all circumstances, as too many factors can play an additional part.

Overview of single AV-C performance scores

Vendor  File copying Archiving /
 Installing /
Launching Applications Downloading Files  
 First Run  Subsequent Run First Run Subsequent Run
Avast perf-level-fast perf-level-veryfast perf-level-veryfast perf-level-veryfast perf-level-fast perf-level-veryfast perf-level-veryfast
AVG perf-level-fast perf-level-veryfast perf-level-veryfast perf-level-veryfast perf-level-fast perf-level-veryfast perf-level-fast
Avira perf-level-fast perf-level-veryfast perf-level-veryfast perf-level-veryfast perf-level-veryfast perf-level-veryfast perf-level-veryfast
Bitdefender perf-level-fast perf-level-veryfast perf-level-fast perf-level-veryfast perf-level-veryfast perf-level-veryfast perf-level-veryfast
BullGuard perf-level-mediocre perf-level-veryfast perf-level-fast perf-level-fast perf-level-veryfast perf-level-veryfast perf-level-veryfast
Emsisoft perf-level-fast perf-level-veryfast perf-level-fast perf-level-veryfast perf-level-fast perf-level-veryfast perf-level-veryfast
eScan perf-level-fast perf-level-veryfast perf-level-fast perf-level-veryfast perf-level-fast perf-level-veryfast perf-level-veryfast
ESET perf-level-fast perf-level-veryfast perf-level-fast perf-level-veryfast perf-level-veryfast perf-level-veryfast perf-level-veryfast
Fortinet perf-level-mediocre perf-level-mediocre perf-level-fast perf-level-veryfast perf-level-veryfast perf-level-veryfast perf-level-mediocre
F-Secure perf-level-fast perf-level-veryfast perf-level-veryfast perf-level-mediocre perf-level-veryfast perf-level-veryfast perf-level-fast
Kaspersky Lab perf-level-veryfast perf-level-veryfast perf-level-veryfast perf-level-veryfast perf-level-fast perf-level-veryfast perf-level-fast
Lavasoft perf-level-mediocre perf-level-veryfast perf-level-fast perf-level-fast perf-level-veryfast perf-level-veryfast perf-level-veryfast
McAfee perf-level-fast perf-level-veryfast perf-level-veryfast perf-level-veryfast perf-level-fast perf-level-veryfast perf-level-fast
Microsoft perf-level-fast perf-level-fast perf-level-fast perf-level-fast perf-level-veryfast perf-level-veryfast perf-level-veryfast
Panda perf-level-fast perf-level-fast perf-level-fast perf-level-fast perf-level-fast perf-level-fast perf-level-veryfast
Quick Heal perf-level-mediocre perf-level-fast perf-level-fast perf-level-fast perf-level-mediocre perf-level-veryfast perf-level-veryfast
Sophos perf-level-fast perf-level-fast perf-level-fast perf-level-veryfast perf-level-fast perf-level-veryfast perf-level-veryfast
Tencent perf-level-fast perf-level-fast perf-level-fast perf-level-veryfast perf-level-fast perf-level-veryfast perf-level-veryfast
ThreatTrack perf-level-mediocre perf-level-mediocre perf-level-veryfast perf-level-mediocre perf-level-mediocre perf-level-fast perf-level-veryfast
Trend Micro perf-level-fast perf-level-fast perf-level-fast perf-level-fast perf-level-fast perf-level-veryfast perf-level-fast
Key perf-level-mediocre Medicore perf-level-fast Fast perf-level-veryfast Very fast

PC Mark Tests

In order to provide an industry-recognized performance test, we used the PC Mark 8 Professional Edition5 testing suite. Users using PC Mark 8 benchmark6 should take care to minimize all external factors that could affect the testing suite, and strictly follow at least the suggestions documented inside the PC Mark manual, in order to get consistent and valid/useful results. Furthermore, the tests should be repeated several times to verify them. For more information about the various consumer scenarios tests included in PC Mark, please read the whitepaper on their website.

“No security software” is tested on a baseline system with Windows Defender disabled, which scores 100 points in the PC Mark 8 Home benchmark.

Summarized results

Users should weight the various subtests according to their needs. We applied a scoring system in order to sum up the various results. Please note that for the File Copying and Launching Applications subtests, we noted separately the results for the first run and for subsequent runs. For the AV-C score, we took the rounded mean values of first and subsequent runs for File Copying, whilst for Launching Applications we considered only the subsequent runs. “Very fast” gets 15 points, “fast” gets 10 points and “mediocre” gets 5 points. This leads to the following results:

AVC ScorePC Mark ScoreImpact Score
15.Quick Heal5898.718.3
16.Trend Micro5598.921.1
18.Fortinet, ThreatTrack5097.527.5

Award levels reached in this Performance Test

The following award levels are for the results reached in this performance test report10. Please note that the performance test only tells you how much impact a security product may have on a system compared to other security products; it does not say anything about the effectiveness of the protection a product provides, so please have also a look at the results of recent Real-World Protection and File Detection tests on our website.


The on-access/real-time scanner component of anti-virus software runs as a background process to check all files that are accessed, in order to protect the system continuously against malware threats. For example, on-access scanners scan files as soon as they are accessed, while (e.g.) behaviour-blockers add a different layer of protection and monitor what the file does when it is already execut-ed/running. The services and processes that run in the background to do these tasks also require and use system resources. Suite products usually have a higher impact on system performance than anti-virus-only products, as more services/features are included and running in the background.

Security products need to be active deep in the system in order to protect it, e.g. to scan processes and so on that are already active during the system start-up, to identify rootkits and other malware. Those procedures add some extra time and thus a delay in system boot/start up.

If a product takes up too many system resources, users get annoyed and may either disable or unin-stall some essential protective features (and thus considerably compromise the security of their sys-tem) or may switch to security software that is less resource-hungry. Therefore, it is important not only that anti-virus software provide high detection rates and good protection against malware, but also that it does not degrade system performance or trouble users.

While this report looks at how much impact various Internet security products have on system perfor-mance, it is not always the security software that is principally responsible for a slow system. Other factors also play a role, and if users follow some simple rules, system performance can be improved noticeably. The next sections address some of the other factors that may play a part.

A few common problems observed on some user PCs:

  • Old hardware: If a PC already runs at a snail’s pace because it has ten-year-old hardware, us-ing modern (security) software may make it unusable.
    • If possible, buy a new PC that at least meets the minimum recommended requirements of the software you want to use. Multi-Core processors are preferable.
    • Adding more RAM does not hurt. If you use Windows 7, you should use a minimum of 4GB of RAM. If you use Windows XP, Vista, 8 or 8.1, switch to Windows 10 64-Bit.
    • Make sure you have only ONE security program with real-time protection. If your new PC came with a trial security suite, remove this before installing a different protection program.
  • Keep all your software up-to-date: Using an anti-virus version from e.g. 2013 may not pro-tect you as well as the newer version would, even though you may still be able to update the signatures. Please keep your operating system up-to-date by installing the recommended patches. Any software can have vulnerabilities and bugs, so keep all the software installed on your PC up-to-date: this will not only protect you against many exploits and vulnerabilities, but also give you any other application improvements that have been introduced.
  • Clean up the content of your hard disk:
    • If your hard disk is almost full, your system performance will suffer accordingly. Leave at least 20% of your disk space free and transfer your movies and other infrequently ac-cessed files to another (external) disk. If money is not an issue, consider buying solid-state drives (SSDs).
    • Uninstall unneeded software. Often, the slowdown that users notice after installing an an-ti-virus product is due to other software on the PC running in the background (that is, due to software conflicts or heavy file access by other programs, each access requiring an-ti-virus scanning).
    • Remove unneeded entries/shortcuts from the Start-Up folder in the All Programs menu.
    • If your PC is already cluttered with residual files and registry entries left over by hundreds of applications you installed and uninstalled after trying them out, reinstall a clean oper-ating system and install only software you really need (fewer software installations means fewer potential vulnerabilities and conflicts, and so on) and use e.g. an image/backup tool in order to return to a clean system without reinstalling everything.
  • Defragment your hard disks regularly: A fragmented hard disk can have a very big impact on system performance as well as considerably increasing the time needed to boot up the system. A minimum of 15% free space on a hard disk is necessary for effective defragmentation. Please note that defragmentation is not necessary with a solid-state drive (SSD) and can reduce its lifetime.
  • Fingerprinting/Optimization: most anti-virus products use various technologies to decrease their impact on system performance. Fingerprinting is such a technology, where already scanned files do not get rescanned for some time or (more rarely) or are whitelisted. This increases the speed considerably (especially after a longer period of PC usage), but also adds some potential risk, as not all files are scanned anymore. It is up to the user to decide what to do. We suggest regularly performing a full-system scan (to be sure that all files are at least currently found to be clean, and to further optimize the fingerprinting).
  • Be patient: a delay of a few additional seconds due to security software is not necessarily a big deal. However, if even with the suggestions above the performance of your PC still annoys you, you should consider trying out another anti-virus product. If you only notice a slow-down after using the anti-virus for a long time, there are probably other factors behind the slowdown. Never reduce your security by disabling essential protection features, just in the hope of gaining a slightly faster PC!

Copyright and Disclaimer

This publication is Copyright © 2015 by AV-Comparatives ®. Any use of the results, etc. in whole or in part, is ONLY permitted after the explicit written agreement of the management board of AV-Comparatives prior to any publication. AV-Comparatives and its testers cannot be held liable for any damage or loss, which might occur as result of, or in connection with, the use of the information provided in this paper. We take every possible care to ensure the correctness of the basic data, but a liability for the correctness of the test results cannot be taken by any representative of AV-Comparatives. We do not give any guarantee of the correctness, completeness, or suitability for a specific purpose of any of the information/content provided at any given time. No one else involved in creating, producing or delivering test results shall be liable for any indirect, special or consequential damage, or loss of profits, arising out of, or related to, the use or inability to use, the services provided by the website, test documents or any related data.

For more information about AV-Comparatives and the testing methodologies, please visit our website.

(November 2015)