TC4 poor performance

As per title I'm experiencing very poor performance with the modpack I put together. I've tried disabling all the addons and running the game with just TC and Baubles but still I'm experiencing pretty heavy drops in FPS. Is it just a quirk of the 1.7.10 game version? I've even tried running one of the bloated modpack versions with TC6 in 1.12 and that seems to run just fine.