I know, i had only 3GB allocated in launcher, and i was using no extra parameters. I started Agrarian Skies from scratch with Java 8, hosting and playing multiplayer and have not encountered any problems yet. I also tested it on custom pack, mix of FTBLite2 and some mods from Monster (big reactors, AE, etc...).Well 1. It should only have 2-3 gigs allocated, 4 at most
2. Java 8 is sometimes buggy and has not been tested.
But it is worth trying.
It's always been the opposite for me, things run much better and take less RAM than before.
You don't want to allocate only 512M ... Have 2500 at minimum.Hey try to delete all the Java arguments and set only this up:"-Xms512m -XX: PermSize=512m -XX:NewRatio=3 -XX:SurvivorRatio=3". And i know that some of your arguments are outdated...