My games are optimized for tablets & phones.
What's your Intel XDK settings for this game? Take a pic of it.
Also, regarding the poor performance, check your C2 project settings:
Fullscreen scaling, change from High Quality to Low. Your project is already 1080p, you do not need to use HQ, it will look fine on Low on mobile screens.
Use High-DPI Displays: change Yes to No. Again related to the high resolution of your game, there's no need to have Yes here, it just take additional resources to render.
Try it, performance should improve massively, without much of a reduction in image quality.