I strongly recommend you use ISboxer... You can get at least a free 7 day trial and the subscription cost is less than 1/3 of a single WoW subscription and helps you get so much more out of WoW and other games...
If you are running ISboxer you can easily control both ForeGround and Background FPS settings via:
https://isboxer.com/wiki/CPU_Strategy_Wizard
If you are not running ISboxer, there may be other ways, but I initially did it via MSI Afterburner's RivaTuner (these days I just do it via ISboxer). It may have been the case back then that either ISboxer didn't have the features for this yet (though it does now) or I just didn't know how to do it via ISboxer... I remember in the older MSI version I used back then being able to set it graphically for both ForeGround and BackGround but according to this thread these days you can set the ForeGround from the GUI but set the BackGround via a config file (either Globally or for the game's application profile):
https://www.reddit.com/r/pathofexile/comments/dd3ou3/automatically_limiting_fps_in_background_using/
When I was exceeding the limits of my laptop I remember testing various BackGround FPS settings as low as 2-8 for my WoW clients and other games and they made huge differences on my laptop's temperatures and utilization though some were too low for things to work consistently (follow got messed up, commands were lost sometimes, etc). Different games can handle different minimums and I could be wrong but I think back then I settled in at 8 FPS for WoW but likely the appropriate thing is to try various settings to see what works best for you in your environment.
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