Why So Little FPS In Minecraft With Labymod?

Moinnn have less FPS with Labymod than with the normal MC version (1.8.9)

I have around 250 FPS with Labymod and around 800/1000 FPS with the normal client

My PC setup consists of:

CPU: Ryzen 5 3600x

Graphics card: Geforce GTX 1660 OC

Ram: 16GB Corsair Vengeance Ram 2667 MHZ

Mainboard: MSI B550 A Pro

Labymod is just not a vanilla, the addons need performance. If you've installed the Forge variant, you also have a complete system for mods with you, which also reduces your FPS.

The thing is my colleague has 1300 fps or so with Labymod and well a 1660 TI but despite the TI I don't think that he gets so much more FPS just because it's a TI, he also has Labymod so that results for me not so much sense…