Please try the following:
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Open the file \data\avast4.ini, and add the following line to the [WebScanner] section:
ModifyVistaSocketAutoTuning=0
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Save the changes, restart the computer and see if it makes any difference.
If that does not help, try:
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Run CMD prompt (as an administrator).
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Type:
netsh interface tcp set global autotunninglevel=disabled
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Terminate and restart WebShield. Do you see any difference?