Wow, the Nintendo Switch has a fan? It is amazing how thermals are such a limiting factor in today's devices. I remember that a browser dev increased the Nexus 5's benchmark score drastically by placing it on a bag of ice.
If the browser was stressing the system to the limits of the thermal envelope, then by being able to dissapate heat faster, you can schedule more work to be done delaying any kind of frequency governing.
e.g., if I start an h264 encode, first my CPU boosts, reaching 3.3 GHz (it's a 2.7 GHz i7), but after a minute, it's dropped to 2.4 GHz due to the thermals. Wouldn't surprise me if I stuck it in a freezer it would stay at a higher frequency.
Heat dissipation is a real issue for many devices.
If it's thermal throttling, then cooling is going to help.
https://www.gizmodo.com.au/2015/06/if-you-water-cool-the-new...