Avast free- slow connection/fragmented streaming

Since yesterday I have been experiencing slower internet connection which resulted in slow page loading and fragmented streaming. Up to now I did not have this problem. I have tried making some changes to the wedshield as recommended by avast but things did not improve. My system runs windows 7 and the avast free specs are 18023-8 on 17.9.23.22.
Any help will be appreciated.

What changes ??? Did anything else change yesterday ??? Updates, new programs added ???

Do you have other machines or devices connected on the same network? Do you experience the same issue?
If yes then possible it’s within your network and must be reported to your ISP.