[SOLVED] Why am I getting sudden FPS drop in Minecraft ?

Jan 14, 2021
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Hey i recently got a new laptop as an early birthday present

I wanted to play Minecraft on it,

the first time I ran it I got a smooth 280 fps with no shaders or resource pack,
When i installed BSL and NAPP I got 120fps. Now I get 40 max,
I don't know whats going on so could someone help ?

my specs:

i7 9750H
GTX 1660ti with 6GB of VRAM
16GB of RAM