For some reason, when I play the game on my phone, the rendering is fine. However, when I wanna test it via studio, on different mobile devices, the rendering becomes extremely annoying. Not sure if there is a setting I need to adjust, or if it is just simply how studio will work.
You are actually running a device emulator, and an emulator uses a lot of RAM and CPU. Try closing any other apps running on the background.
As @DMCPEPlays said try closing a program. I know there is a setting that allows you to increase ram usage or cap it on studio for the device emulator maybe try that and increase it.