mojoin

Hello! Ive been having this problem with almost all of the mod packs on technic launcher. VOLTZ start up is fine then when i get into the game the mouse selection and when it lights up is very slow and also i've done many things like clear all of technic launchers files and more RAM for usage but nothing seems to work for me. The modpack I would really like to play is VOLTZ any help will do. SIDE NOTE --------------- I've played with more mods and its lagged less VOLTZ has 49 and I have played with 137 and ALOT less lag on FTB is it just technic launcher or me?