@Abhijeet_980 From your image it seams that you've got a lot more performance than needed, but it could also be misleading if you minimized your game when you checked these stats, since a minimized application is unprioritized and in some form av sleepmode.
However, if you can play arenas just fine, but not battle royal, it could be your graphics card (gpu) that's the issue. Arena maps are quite small and require much less performance to render. Did you try to lower your graphics settings in-game?
What gpu do you use?