My laptop is overheating really fast, while having multiple tabs open on firefox or running a game like Hearthstone on Wine. Just today I took the whole laptop apart, cleaned it and changed the thermal paste. Still my fan is really loud and the keyboard area (upper left quarter where the fan) is really warm. Never had issues with it while running Windows.
I had overheating problems even in Windows, but I don’t want to change back as I enjoy working around in Suse
From Asus site specs it could have an optimus system (intel + nvidia), so the first thing to do is check if you have the video drivers correctly installed, possibly changing to the proprietary nvidia driver - but with optimus implementation.
I highly recommend you install suse-prime. https://software.opensuse.org/package/suse-prime
It is a better solution than Bumblebee for switching from Intel to Nvidia.
This package allows you to use the drivers downloaded from the Nvidia site.