Author Topic: Extremely Slow Full System Scans  (Read 3193 times)

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Joe S

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Extremely Slow Full System Scans
« on: February 15, 2010, 01:14:29 AM »
I just switched from 4.8 free to 5.0 free and full scan speeds are extremely slow. MY old Dell XP took about 47 min on 4.8 and over 1hr 39 min with 5.0. On my 64 bit HP with Windows 7 and 8 g ram after 39 min it was still at o% a full scan on 4.8 took about 25 min. Any clues to what the problem is? I didn't see any speed settings for scan.
Joe

Offline superhacker

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Re: Extremely Slow Full System Scans
« Reply #1 on: February 15, 2010, 01:26:31 AM »
it is normal thing,stop the scan then rescan"and may the cache of avast created"
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Offline DavidR

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Re: Extremely Slow Full System Scans
« Reply #2 on: February 15, 2010, 01:31:41 AM »
It is difficult to directly compare 4.8 and 5.0 scans since you don't say what scan you did on 4.8. For me the scans on 5.0 after a few are quicker for a comparable 4.8 scan. Not to mention you can have greater customization of the 5.0 scans or create a custom scan.

However, initial scans in 5.0 are going to be slower as it is also populating the persistent cache database, which should after a while increase overall scan speed. I have never held much store in progress meters though mine appears to be working, but there is a lag, just started a scan whilst typing this and for a short while it showed 0% yet the other data showed it had scanned 17,750 files, 2.46GB of data in 24 seconds. There isn't a great deal of data on my system, no media files, etc. so perhaps on your system it is in a folder or partition that has very large files ?

So whilst it is showing 0% scanned on yours is it also reporting what has been scanned ?

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Use persistent caching - if persistent caching is used, the information about
the scanned file is stored in the permanent memory. This means it is not lost
after a system restart and it is also not affected by virus definition updates.
Consequently, persistent caching is suitable only for files which are guaranteed
not to contain any virus infection e.g. operating system files, files signed by
trusted publishers, or other files covered by the avast! whitelist. This box is
checked by default; if you want all files to be scanned regardless of their
trust status, this box should be unchecked.
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Joe S

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Re: Extremely Slow Full System Scans
« Reply #3 on: February 15, 2010, 01:56:57 AM »
Ok I'll try again. It was just a shock after running Avast 4 for so long then seeing such slow times with 5.0 on first scan. I'll try and post back after I try again. Not sure when My Dad is having a bad day he's 84 and I take care of him alone.
Joe

Offline DavidR

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Re: Extremely Slow Full System Scans
« Reply #4 on: February 15, 2010, 03:14:56 AM »
OK, personally I tend just to do a Quick scan now with the new avast5 and that for me is blisteringly fast. Whilst my system isn't as data laden as most nor as fast as yours.
Windows 10 Home 64bit/ Acer Aspire F15/ Intel Core i5 7200U 2.5GHz, 8GB DDR4 memory, 256GB SSD, 1TB HDD/ avast! free 23.9.6082 (build 23.9.8494.792) UI 1.0.781/ Firefox, uBlock Origin, uMatrix/ MailWasher Pro/ Avast! Mobile Security

Joe S

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Re: Extremely Slow Full System Scans
« Reply #5 on: February 15, 2010, 05:52:23 AM »
I had a little more time to investigate. On my windows 7 machine doing a full scan with 5.0 it gets to about 13 gigs and faults that's still in system/program files. There is a red X in tray Icon. When I click repair there are some shields disabled.  I've uninstalled and reinstalled tried a new download did a hash check but get the same result. A quick scan works and is fast. So I went back to 4.8 for now.
Joe