Seems like the problem is in your client code. Please tweak Two Way Streaming example code minimally to reproduce the issue and send us the code modified using this form.Some users have the issue. most of users have the video in their side.
This depends on publishing resolution and bitrate. For example, you'll need 10 Mbps upload/download channel to publish or play FullHD (1080p) stream, 20 Mbps to publish or play 2K stream. If yuo have only 1 Mbps channel, you can publish or play 320X240 stream only with acceptable quality.What is the minimum internet speed to show the video in browser?