Then you can delay the avast auto update check (it isn't uploading but downloading if an update is available):
- In avast5 you need to edit (using notepad)
avast5.ini the
[InetWD] section of the C:\Documents and Settings\All Users\Application Data\Alwil Software\Avast5\avast5.ini
- Broadband connections, add this line:
AlwaysConnectedWaitSeconds=120 and
AssumeAlwaysConnected=1 if not present (or edit AssumeAlwaysConnected=0 to AssumeAlwaysConnected=1)
[InetWD]
AssumeAlwaysConnected=1
AlwaysConnectedWaitSeconds=120
When complete save the changes, avast's self-defence module will ask for confirmation, etc. answer Yes.
The figure is seconds and the above equates to two minutes, you could try that and adjust upwards if required, 180, 240, etc.