I think that a better way to do it is probably in the OS, rather than in-game, on a per-game basis
Low power mode on macOS gives that kind of feature. It works well because the computer never goes beyond a certain threshold of power. I guess it’s a simple downclock of some sort, but the caveat is that it won’t adapt to more demanding zones of the game.
Permit for two different sets of saved video settings, where the player can flip between them. Honestly, I think that this is probably more tweaking than most players are going to do.
I used to do exactly that with macros in World Of Warcraft. I had 3 different kind of setup for Efficiency, Balanced and Quality gaming. That game was the first that I know of to introduce built-in FPS capping during WOTLK extension, and 10 different settings mode plus the ability to make even more custom tweaks. My only wish is that every game developer to do the same.
Provide some kind of adaptive quality mechanism. Then, if the computer becomes “lower end”, then the adaptive quality system just twiddles settings until the target framerate is maintained.
Speaking of WoW, there is a target FPS setting that will make the game lower the compute demand, but it wouldn’t help in my case since it’s meant to use as much compute power as possible to reach an FPS goal. It could do the trick if it could be coupled to a Don’t use more than 50% of the compute power, but I’m not sure a game can understand how much a computer has without reaching its limit first. Maybe some kind of benchmarking could help though.
Speaking as a player, though, I don’t much care about power consumption if a system has wall power.
Me neither. But I do enjoy a silent machine !
For phones, I kind of wish that Google would consider providing a “battery usage” rating in the app store that provides some kind of approximate metric for how much CPU time the game uses while active.
That would be very useful indeed! And another incentive for developers to write better code.