As u know like there is no ROM without heating issues , only we can expect only less heating or you can do it manually by using kernal and downgrading the cores clocking speed !Are there no heating issues? Performance? Have you tried it yourself?
As I tried firehound is a bit good ROM in case of your requirements go for "citrus ROM " , less heating issues and awesome battery backup .:silly:
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I'm a huge fan of miui Roms , as in my previous device I got a plenty of miui ROMs but to this new mobile (athene) I can't find much miui stable ROMs ! Why ?