Lineage OS runs smooth when plugged in but lags without plugged in

hi i figured out now that the phone when its plugged in the pc runs smoorh and when i unplugged it it stutters .the cpu frequenzes and also the load times stays the same.battery ks in balanced mode… in an old topic in /e/ forum i also found this problem but as good as my english is its seems solved( or not;) i tried lineage 17.1 also 18.1 made clean installes …does anybody know how to fix it without switch it to performance mode…or is it still a known problem in Lineage Os…?
p.s. its stuttering also when i plug it in the power suplly…so only when i plug it to a pc it stops

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