How come every time I unplug my gaming laptop from the charger it gets significantly slower but when I put the charger back in, it runs smoothly and n

[Justin S.1]

I have a Dell G15 5520. I plug in the charger 24/7 so it doesn't run out of battery and because it's more smooth and more normal when I play games or just search things up. When I first got it, it wasn't like this and it was normal and smooth until a few days later when I wanted to move my laptop somewhere else and I played a game, it was slower and lagged once or twice with the charger unplugged. (Before this the laptop was charged 24/7 since I got my laptop) I searched it was bad to keep it charged forever and that it can also drain the battery faster, which already does, how do I fix this?

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