Now let me just say this before I go into my problem, I love Xbox game streaming. Thanks to my nearly flawless internet plan and router, I can work and play on my PC all the time. It is very useful, and I enjoy it very much. Or at least I enjoyed it before...

Now I don't know what suddenly happened, but now it seems to lag and work like garbage. Now I've tested my internet connection on both my PC and Xbox, and both seem to be just fine, so that isn't the issue. I've tried reseting my router and modem; I've tried cold booting the Xbox One; I checked to make sure the IP was correct; I made sure it was on the right network; I tried to see if Xbox live was having issues; I checked to see if there wasn't enough bandwith (though I doubted this in the first place, and the app showed there was plenty), but I wasn't able to find the problem! I even tested the stream in app, and it worked fine! The audio came out clear, and every quality was playable according to the app. But the second I used it, it would lag and work out horribly. Playing on very high was no different from low, and I am just utterly pissed. Now I assume this is Microsoft's doing, given their horrible track record with Windows 10 updates, and given this has only been a problem for the past 2 days, I recon they screwed up again. Hopefully someone here has a solution, or at least has the same problem as me. Because right now, my patience runs very low with Microsoft. 

Edit: Was my graphics card. 

If anyone else is having problems, please reply below. I could use some input, and hopefully I can contact Microsoft to see if they have a solution in the works.

You tried contacting MS or Xbox customer service? Sounds really frustrating, especially if you've done the checks and still don't know where things are going wrong. 

Thanks. Hopefully they do fix this up, as it is a very usefull feature.

You tried this? 

http://support.xbox.com/en-GB/xbox-one/networking/streaming-quality-solution

Just used it 5 mins ago. Worked fine.

Also there are quality settings in the upper right of the game streaming you can adjust it lower for better results. I usually don't use very high but keep it at high.

Yep. Tried all the steps, but nothing seemed to work (for some reason, I can't stream on a wired network).

I tried all the quality settings (low to very high), but it wouldn't make a difference. #Frustrationlevelsat9000

Have you installed anything new on the network? new devices which might be causing a lot of network traffic like a wifi printer or any new programs on your PC which might be interfering with the streaming quality? ... Have you accidentally updated Street Fighter V and installed Capcoms rootkit! Any changes which might have happened?

Also are you just using wireless for the console to the router? could you try it with a cable to the console if it is reachable and see if that works a bit better using just wired connections just in case one of your neighbours happens to have some device which is interfering with Wifi in your area, heavy equipment or microwaves... plorescent light bulbs? :s