Pls help

[Sirfancylot]

Im trying to play modded minecraft with a couple of friends ( nostalgia's sake ). 

My game is working fine and one of there's is working, but the third's game isnt working. Whenever he spawns the game works for like 5sec and then it freezes (no crash). He's using forge 1.7.10 (latest version). Java is updated, and so are his drivers. No matter how much we tinker with settings it doesnt work.

P.s. we tried 1.12 forge and it worked but we dont want ti

P.p.s. i was going to add the mod list but when he removes all the mods it still freezed.