Thank you superhacker and Mr.Agent, I did as your considerations, cleaning my system, but it's still slow. I'm inclined to believe that avast 5.0 is avoiding to take the cache, so the system has to spend time loading the frames and so on. When I used avast 4.8 this wasn't happen, so my machine doesn't have problems (I think...). I don't believe in register errors caused by conflict among 2 antiviruses, because I used ever the avast. These programs like CCleaner, Glary, Advanced SystemCare aren't able to do so great damage (conflict), as also I've used them a lot, to clean the PC weekly, as I do also a defrag, directly from Win tools.
In the other hand, I'll check the sets of the router filters that can interact with the new capabilities of v. 5.0
Thank you anyway.
Best regards.
Luiz