when i play on the inside maps like the game or lery's my fps is super low like 15 fps
No, are you playing on ultra?
im playing on the lowest settings my pc is not that good but it was running fine before the unreal engine update
Yeah it's making it tough on computers that are not up to date, I don't agree with it. Hopefully the devs will address this.
One thing you can try is to use old nvidia driver. Also make sure that your nvidia settings are optimal done.