Connectivity to sites in China: takes minutes, disconnects, stalls

Does the Great Firewall of China have something against connections coming from Comcast.   A couple of times a month when I try to connect to sites based in China (hosted by Alibaba Cloud) the connections take 5-10 minutes, stall, never complete, disconnect, etc.

My colleagues who use other internet providers do not see any of these problems.

What gives?