Emulator

I'm on my Samsung S7, the android version of dolphin. I play Mario Kart Wii on the emulator and its always playing at 20-30 fps and I noticed that when I pause the game, go out of the app, and let it sit for awhile I then go back into the app, resume, and it runs at 60 fps, but it doesn't always work. I don't fully understand how this works, it may just be that the game still hasn't loaded all the way and by letting it sit, it has a chance to load all of its elements and all the way through a map it stays at 60 fps until it switches to the next map or back to the menu screen. I hope that was useful in anyway.