Strangely low framerate in Shadow Fight 2 for Windows 8

I once worked porting a game from iOS to Windows 8.1 app. The process was quite cumbersome to say the least. The problem with 8.1 apps is that they sometimes require an extra layer of processing to handle the Windows OS calls. As previous Windows products, it doesn't like following standards so much. It prefers to establish its own.

Even after the porting, the game didn't work as well as in iOS, we spent some time fixing things that got broken out of nowhere during the transformation, and in the end the game worked well, but nos as flawlessly as in the iOS version.

So I'd say that if the game was not originally developed as a Windows 8.1 app, then such game is likely to have porting issues, as developing for the other platforms is quite different than developing to Windows 8.1. Keep in mind also that this will affect the use of your computer resources by the game, as, if it is a port, the game will be designed to work with low resources and not with a full fledged PC. That's one of the cons of the 8.1 app portability. You can only avoid the previous issues when building the game in question from scratch with the Windows 8.1 environment as a target.