Streaming rides on FulGaz requires a faster, more reliable internet connection than movie streaming services such as Netflix or Amazon. This is because FulGaz videos are streamed to you in one continuous video file, rather than many smaller "chunks" of video data.
Streaming services chop video into tiny chunks then swap between quality levels depending on the bandwidth available. This is why Netflix can go pixelated for a while (dropping to a lower resolution) then recover again.
There is a huge difference in the internet speed requirement for each resolution. To reliably stream FulGaz rides you will need a sustained internet speed of double the bitrate of the video file. For each of the three quality settings, this works out to roughly:
4K = 40 Mbit/s
1080p = 12 Mbit/s
720p = 8 Mbit/s
The video quality you have chosen in Video Settings is the quality you receive the entire ride, even if your internet can't cope.
Stronger riders can often have more streaming issues! This is because the faster you are riding compared to the original video speed, the more video FulGaz needs to stream per second. This will push you closer to the upper limit of bandwidth required.