Board Thread:LotR Mod Technical Support/@comment-45.3.12.5-20160521034837/@comment-27516710-20160521181957

I usually set up a totally separate profile for each mod using the vanilla Launcher. That way I can put each mod in its own directory and each mod has its own screenshots, etc.

As far as allocating memory for the JVM arguments portion of my LOTR profile I use this:

-Xmx2G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M

You can change the "2" to something larger to allow MC to use more memory.

You could be hanging up due to Minecraft running out of memory, or, sometimes fussy hardware like a failing hard drive, etc. can cause MC to get stuck on the loading screen. But if vanilla works fine you might just need to give the LOTR profile more RAM.