Hi ive been trying to play single player for a fe weeks it works fine when i play on a server but not when i try singleplayer it laggs and i cant even get any menues up without the game freezing every time i try to do anything, im using 1.12.2 and all the mods are up to date imunsure as to wether i need a server to play alone because this is the only thing i can think of, i serched the web and i can't find any way it works i dont really want to buy a server just to play alone!
If anyone can help iwould be so greatful!

Thankyou
KrimsonSucccubuz