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Why is avast scan so slow


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#1 Splinter46

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Posted 26 June 2014 - 04:36 AM

I just got through running a scan with Avast. It took forever.  Not sure if some of my other downloads 'Comodo', Spybot' or 'spybot' are making it crawl painfully slow.  Thoughts?

Edit: Split and moved topic from News to the more appropriate forum.~ Animal
Edit: Split from Avast forum taken offline due to ~400,000 user's account info being stolen and title changed to reflect topic question. - QM7

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#2 quietman7

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Posted 26 June 2014 - 04:59 PM

The speed and ability to complete an anti-virus or anti-malware scan depends on a variety of factors.
  • The program itself and how its scanning engine is designed to scan: using a signature database vs heuristic scanning or a combination of both.
  • Options to scan for spyware, adware, riskware and potentially unwanted programs (PUPS).
  • Options to scan memory, boot sectors, registry and alternate data streams (ADS).
  • Type of scan performed: Deep, Quick or Custom scanning.
  • What action has to be performed when malware is detected.
  • A computer's hard drive size.
  • Disk size and used capacity (number of files that have to be scanned).
  • Types of files (.exe, .dll, .sys, .cab, archived, compressed, packed, email, etc) that are scanned.
  • Whether external drives are included in the scan.
  • Competition for and utilization of system/CPU resources by the scanner.
  • Other running processes and programs in the background.
  • Whether the scanning engine stalls, hangs or freezes.
  • Interference from malware.
  • Interference from other security programs attempting to scan at the same time.
  • Interference from other programs attempting to update (download/install) components from the Internet.
  • Interference from the user (whether or not you use the computer during the scan).
Note: Using two or more program security scanning engines at the same time can cause each to interfere with the other, cause systems hangs, false detections, unreliable results and other unpredictable behavior.

You may also want to read How an Antivirus Program Works.

To speed up a scan, uninstall unnecessary programs, clean out temporary files, temporarily disable any other real-time protection tools, close all open programs, perform a Quick Scan instead of a Full one and do not use the computer during the scan. In some case you may need to try scanning in safe mode.
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#3 quietman7

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Posted 26 June 2014 - 05:11 PM

BTW...it is not unusual for an anti-virus or anti-malware scanner to have problems with or be suspicious of compressed, archived, .cab, .rar, .jar, .iso, and packed files because they have difficulty reading what is inside them. These kind of files often trigger alerts by security software using heuristic detection because they are resistant to scanning (difficult to read). This resistance may also result in some scanners to stall (hang) on these particular types of files or just ignore (skip) them. Certain files in the System Volume Information Folder like the Tracking.log (created by the Distributed Link Tracking Service to store maintenance information) have also been reported as a source causing some scanners to hang.
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#4 Splinter46

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Posted 26 June 2014 - 11:38 PM

quietman7...Thanks for your response.  I do have other security programs running which may be part fo the reason Avast runs so slow. I'll shut one down at a time then run the scan again to see if that helps.  Thanks for your help.



#5 quietman7

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Posted 27 June 2014 - 06:10 AM

You're welcome.

BTW, I generally start a scan early in the evening before going to bed and check back in the morning.
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