It is likely that installing AVG also installed a browser toolbar that is intended to check all data from a web site before it is rendered by the browser.
You can check Firefox's add-ons to see if a toolbar/add-on for AVG has been installed.
If not it may be that another add-on is causing problems so you could do an elimination test by disabling them one at a time and testing.
But I also see Lavasoft's AdAware and Spybot's Search & Destroy. These both have 'background running' components that scan everything that comes into the system, just like an anti-virus. If Lavasoft's AdWatch and/or Spybot's TeaTimer are running then they are not needed when using today's anti-virus and anti-malware scanners. I would disable those resident scanners then uninstall both Lavasoft and Spybot and see if that improves performance.
I use- W7 Home Premium+SP1; AVG 2012; Adaware 9.0.7; SpyBot 1.6.2. Firefox 7.0.1; (I.E. 9 - not often used). Broadband connection ethernet - Yacom.
I installed the Firefox on 30.9.2011
I installed the latest AVG 2012 on 10.10. 2011
I am not sure if it is because of or coincidently, but my internet browsing has been seriously affected. This has been happening for a few (? 3,4 )days, but has worsened since the installation of the new AVG.
Where I would previously have put a subject into the browser, and the page appeared with a choice of links, a click on one of them would have immediately taken me to that link.
Now, I have to wait for sometimes 25 to 30 seconds to get to the link and even not be allowed to go to the link - it won't open.
I have deleted and re-installed my Firefox and my AVG, but this still happens.
My security scans are done weekly with each programme but on different days - no two scans are done on the same day. At present, there is nothing untoward evident in my computer, an AVG scan was done last evening - 10.10.2011 only cookies were detected.
If anyone has any advice, I would greatly appreciate it!