I recently got a new PC (4070Ti, Ryzen 5 7600X). I know with these specs I should'nt need performance mods but I installed them anyway. I noticed on average I get 500-700 FPS Vanilla but with Sodium it averages at 300-400.

On my old PC (1070Ti, Ryzen 7 2700X) Sodium helped, but also just barely (maybe +50 FPS max.)

I'm currently playing in 1.19.3 (fabric)
Sodium version: sodium-fabric-mc1.19.3-0.4.8+build.22

Can you provide more info? any other mods? what are your configs? this happens on single player or multiplayer? driver version? fabric api version? etc...

There isn't enough information to diagnose this problem, and the issue tracker isn't the place for reporting issues to do with poor performance. Read the known issues and use the Discord server if you are still having issues.