I purchased BD Antivirus Pro a week ago. I had Avira Antivirus Premium which I uninstalled. I had no internet slow down with it. I had no slow down at first with BD but now it is causing a slow down with the internet. If I change it to permissive the slow down goes away. I have no other maleware protection runnning in realtime. I do have Malewarebytes anti-maleware and Superantispyware installed but do not run in realtime. I did run the support tool and saved the file. I am running Win7 64bit and IE9. My system is Asus P67 Sabertooth MB with 8GB memory and a Intel i7 2600k 3.4 cpu. Only the browser is slow and the rest of the system is fine.