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Avast slows down my computer

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I don't know if this has anything to do with a big downstream bandwidth (I have a 4Mbps link through cable modem) but the problem seems to have more impact when downloading big files at 200 KBps rates. In the past I didn't use to have this problem, but after the 4.7 version it became frequent. The last scanned items are either web pages or the files downloaded.

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I noted that during this problem the avast icon is spinning and scanning the files that are downloaded either by firefox or by uTorrent (I download a lot of ISO files through uTorrent that have around 700MB). I already tried to repair the installation, reinstall and multiple reboots. The only way to make it usable again is killing the process manually and stopping the services related to Avast AntiVirus. In both cases the computer is unusable because of the high CPU usage. When using uTorrent (a bittorrent P2P program)

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Click the green (Enabled) slider next to the affected browser, so it changes to red (Not enabled). Open Avast AntiTrack, then select Browsers in the left panel.

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If prompted, click Yes to confirm the change. When browsing the internet using firefox 1.5.0.3 or 1.5.0.4Ģ. Open Avast AntiTrack and select Settings in the left panel, then untick Enable tracking protection and detection. The problem, I believe, is more frequently triggered in the following cases:ġ. Now my ashServ.exe process (from avast 4.7 free edition) takes from 70% to 100% CPU time.