I noticed the same issue on iOS 13.0.1, also safari web browser not proper working on macOS, trying to open safari browser but the browser responding time is very long, but Mozilla browser is best I used in windows platform and now I am trying to install it on my macOS but installation not completed, regarding this issue I contact one technician [https://www.macbookrepairdubai.com/service-areas/business-bay/ macbook repair business bay], they are config some setting and change some firewall setting. now it's working fine.