Avast Free Antivirus
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Full user review
"Slows web speed a lot"
Overall mac performance not affected.
I've got a 65/5 Mbits/s connection speed via cablemodem.
Speed test, as measured by www.speedtest.net and OOkla NetMetrics falls to only 15 Mbits/s for download, upload not been affected.
The download speed is recovered after disabling Avast's Web Shield on preferences, and then restarting the system.
Re-enabling Web Shield and restarting the system recreates the speed problem, while re-disabling it and restarting the system fixes the issue everytime.
Not so good because of this web download speed issue.