Whenever my friend launches Minecraft 1.7.10 with Forge 1.7.10-10.13.4.1558, it is unplayably laggy, even in the menus. Although he is using several mods, this only occurs when Ars Magica 2 is installed This is only a problem for him. My other friend and I can both run it fine with exactly the same version of Forge and every mod. His PC is 64-bit and has good specs, with a good GPU and 12GB of RAM (of which Minecraft is only using up around 1GB).
We have tried a number of solutions, including: - Waiting a while to see if it fixes itself - Increasing Minecraft's RAM allocation to 4GB - Installing JRE version 1.8.0_191 and setting Minecraft to use it As you might guess, none of these worked.
Are we missing something painfully obvious? Or do you need more details to try and find a solution? Thank you very much for your time,