Author Topic: Avast webshield slows down internet speed  (Read 6755 times)

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Offline Ad Pop

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Avast webshield slows down internet speed
« on: March 23, 2013, 05:42:49 PM »
Hi,

Since Avast 7.0.1474 my internet download speed dropped from 75-80Mbit/s to 15-20Mbit/s.
Updates 8.0.1482 and 8.0.1483 didn't cure the problem.

When I disable webshield the speed is 75-80Mbit/s again.
Before 7.0.1474 it was also 75-80Mbit/s with webshield on.

The odd thing is that it's only on my Windows XP SP3 pc, my Windows 7 laptop (also with avast) doesn't have this problem. The win7 laptop has wireless 40-65Mbit/s and on lan 75-80Mbit/s no matter if webshield is on or off.

-I have reset Avast to factory defaults;
-I uninstalled Avast with aswclear.exe,  downloaded again and reinstalled;
Both didn't fix the problem.

I tested the speed with Firefox, IE and Google Chrome on multiple speedtest-sites.
All came up with simular results.

My browsers are up to date, as are flash, java and other software.

I am at a loss what could cause this and hope someone here has an idea.



Offline Pondus

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Re: Avast webshield slows down internet speed
« Reply #1 on: March 23, 2013, 05:55:43 PM »
try a different way to measure the speed.....

download a big file, like xp service pack3..... time the download
then turn off shield and do it again.... what is the time...and how big is the time difference?


Offline Ad Pop

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Re: Avast webshield slows down internet speed
« Reply #2 on: March 23, 2013, 06:28:50 PM »
I dll the sp3 306MB file twice with webshield on and twice with webshield off
It didn't make any difference all downloaded in little less than 3 min.

FF reported dll speeds of 1.8MB/s to 2.8MB/s during download (so 14.4Mbit/s to 22.4Mbit/s).


Offline Pondus

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Re: Avast webshield slows down internet speed
« Reply #3 on: March 23, 2013, 06:35:54 PM »
Quote
I dll the sp3 306MB file twice with webshield on and twice with webshield off
It didn't make any difference all downloaded in little less than 3 min.
so just the webshield that is fooling those online speedtests.    ;)

i had the same issue with Malwarebytes and they told me to try the download test



Offline Ad Pop

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Re: Avast webshield slows down internet speed
« Reply #4 on: March 23, 2013, 06:43:17 PM »
so just the webshield that is fooling those online speedtests.    ;)

That might not be the case, it could also be that upload speeds from the MS server to my pc are not faster than
15-20Mbit/s and that at those speeds there is no problem with avast webshield.


=======================================================
EDIT:

I just noticed a funny thing during all this testing.

After turning all shields off and on again 5 times the speedtests give 80Mbit/s download.
Downloading the XP SP3 file then takes 1 min 40 sec (so around 3MB/s or 24Mbit/s)

Restarted pc: back to the old results, disable/enable shields 5x: speedtests 80Mbit/s download and xp sp3 file download almost twice as fast.


« Last Edit: March 23, 2013, 07:17:47 PM by Ad Pop »

Offline Pondus

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Re: Avast webshield slows down internet speed
« Reply #5 on: March 23, 2013, 07:46:28 PM »
Quote
Restarted pc: back to the old results, disable/enable shields 5x: speedtests 80Mbit/s download and xp sp3 file download almost twice as fast.
mysterious.   ???