The flatpak is container holding all the dependencies the program needs

A newbie on 23.10 ?

Ares as a project has a goal of accuracy at any cost, so tends to need a lot more resources than most other emulators. Before the tragic loss of Near, they wrote an absolutely exceptional article about the development of bsnes/higan and how much power it required for cycle-accuracy of SNES hardware, and it's way more than you would think is feasibly necessary given that emulators like ZSNES (or Gens, as was my Sega emulator of choice at the time) ran under a crappy Celeron in the 90s.

I will say your CPU will likely throttle back well before it'll shut down due to overheating. It might affect emulation performance some, but your PC shouldn't shut down or anything.

The flatpak has all of the required dependencies included in the file and are sandboxed when you run the program. Typically installing the app via your package manager or storefront would rely on dependencies previously installed on your system or install them during the setup process, and running them on the system will draw those resources from wherever they're stored. This is why you'll find flatpaks are typically much larger than the footprint of a traditional program on Linux.

I can't say for sure but I'd venture a guess that the code for the emulator hasn't necessarily changed, so they haven't seen fit to iterate the version number in some time, but the flatpak was rebuilt to include the newer versions of dependencies that interface with your newer hardware. Just a guess though.

Have you tried the flatpak to see if it solves your issue?

It should have all of the dependencies to run it bundled.