All anti-virus programs use memory and can slow your machine as they are constantly running in the background.
We find AVG doesn't use as much as other anti-virus programs and the settings are adjustable.
Unfortunately there a lots of viruses, malware and spyware on the internet.
A free version of any anti-virus will protect you on a basic level but often isn't enough.
If you installed AVG today, then what you are experiencing is not an update, but rather the Cache Server.
The first day you install AVG there will be a lot of activity on your hard drive as the software builds a cache of what it considers safe files.
Some antivirus software is set up to ask you every time it needs to run an update.
Unfortunately, updating your antivirus is the one thing that you should not need to ask permission to do.I thought this was just confirmation bias or paranoia.Now I think that AVG is deliberately ** up my browser response.Also, make sure any previous antivirus software products are uninstalled, and that includes downloading and running the uninstall or removal tools for those software products (Don't rely on any antivirus software's internal uninstaller to complete the job, because it usually doesn't; some small pieces of the software will often be left behind to possibly cause conflicts with your new antivirus software.