Comodo AV scan takes 90% of my CPU

The bug/issue

  1. What you did: Launched the on-demand scanner by right-clicking a folder\partition.
  2. What actually happened or you actually saw: Antivirus on-demand scan process cavscan.exe eats about 90% of my CPU
  3. What you expected to happen or see: Normal behaviour
  4. How you tried to fix it & what happened: -
  5. If its an application compatibility problem have you tried the application fixes here?:
  6. Details & exact version of any application (execpt CIS) involved with download link:
  7. Whether you can make the problem happen again, and if so exact steps to make it happen:
  8. Any other information (eg your guess regarding the cause, with reasons): I have the heuristics level set to High.

Your set-up

  1. CIS version, AV database version & configuration used: Comodo Internet Security 5.8.211697.2124 with Comodo Internet Security configuration
  2. a) Have you updated (without uninstall) from CIS 3 or 4: No
    b) if so, have you tried a clean reinstall (without losing settings - if not please do)?:
  3. a) Have you imported a config from a previous version of CIS: No
    b) if so, have U tried a standard config (without losing settings - if not please do)?:
  4. Have you made any other major changes to the default config? (eg ticked ‘block all unknown requests’, other egs here.): -
  5. Defense+, Sandbox, Firewall & AV security levels: D+= Safe mode , Sandbox= Active, Firewall = Safe mode, AV = Stateful
  6. OS version, service pack, number of bits, UAC setting, & account type: Windows 7 Home Premium SP1 (x86), Administrator account, UAC - Never notify
  7. Other security and utility software installed: none
  8. Other security software previously installed at any time since Windows was last installed: BitDefender Internet Security 2012, Avira Internet Security 2012.
  9. Virtual machine used (Please do NOT use Virtual box):
    I’ve attached a pictures.

[attachment deleted by admin]

Sorry as the new format we need this aswell.

  1. Screenshots of the Defense plus Active Processes List (Required for all issues):

Thank you


Edit This also please

  1. Other security software previously installed at any time since Windows was last installed:

I’ve updated with required informations.

I’ve also spotted the issue occurs while launching a context-menu scan for a folder or partition. It doesn’t bring up if you launch it from the Comodo’s GUI.

Thank you very much for your report in standard format, with all information supplied. The care you have taken is much appreciated by Comodo, and will increase the likelihood that this bug can be fixed.

Developers may or may or may not communicate with you in the forum or by PM/IM, depending on time availability and need. Because you have supplied complete information that may be able to replicate and fix the bug without doing so.

Many thanks again

Moved to Format verified Issue Reports


Is anyone else able to replicate this?
I just updated to the latest 5.8 and the issue is there all the time I launch a context-menu scan (right-clicking a folder).

I get variable high cpu 50-100%, mostly 70-80%.

But on an old XP machine I guess I would anticipate that

Best wishes


XP Sp3
Admin account
3.x GB RAM
3.0 Ghz
CIS 5.8 public

Thank you! I’m using Windows 7 machine, and more than 70% of CPU for a scan is a lot, especially if this doesn’t occur while launching from Comodo’s GUI.

I tried a right click scan earlier starts at 90% for a short while then stays at about 50%

Win 7 x32