Today my Xbox One got another system update, it's now 16299.3033 / 171018-1900. It might only be available to Xbox Insiders.
I tested our game again and now the framerate seems to be a few frames faster? Maybe? It's very unscientific and our game has inconsistent fps, but I feel I'm seeing higher maximums than before.
However I checked the changelog for this update and there's nothing about UWP performance.
Would love to hear back if anyone else has tried testing performance on the Fall Creators Update.
So I've been trying to figure out this Expanded Resources thing as well. I can't seem to get it to work in VS 2017 if I simply open up the sln file (it says that it's incompatible). I found a workaround for this and was able to push to my Xbox dev kit, but it would sometimes freeze up the console and when I did get it to run the performance was still the same as before the Creators Update. The only thing I've been able to find on the subject is this thread which explains you have to change the app type to 'Game' on the Xbox Dev Home, which I tried and didn't see any improvements:
The only other thing I can think of is to push using VS 2015 since Construct 2 is compatible with that and see if that works, but I don't have any high hopes currently.