Flash Player consistently lagging with specific website

Probably you can contact support@fujitv.live to ask for the help. I bought their service and use it on my iPad. Before the subscription, I met some compatibility problem and email to FUJITV support. They provided the assistance in time. I love their service and after-sale support.

Good luck for you.

Here's a really excellent explanation of the problem:

https://www.google.com/get/videoqualityreport/#how_video_gets_to_you

If you're streaming from your phone over the cellular network and not your home WiFi, your traffic might be taking a less congested route to the servers at Fuji TV, or the servers that handle the streams for phones have lower load and/or are sending lower bandwidth streams.

There's not a lot we can do for you here.  You can try disabling hardware acceleration to rule out the possibility that this is a problem with your graphics drivers, but this is almost always a network issue.  Serving video is hard, and there are a lot of possible failure points.

Instructions on disabling hardware acceleration can be found here:

https://helpx.adobe.com/flash-player/kb/video-playback-issues.html

If you're still stuck, I'd recommend starting a conversation with the content provider.  They're in the best position to troubleshoot this.  It may be beyond their control as well, but give them an idea of how they need to invest in order to improve the service.