I left the game open in the missions list for a while (don't know exact times), when I got back I got a Fatal: Java heap space, I believe I have seen this a few times before but don't remember details.
I have LazyLib, combat radar and target leading pip downloaded and active.
1421718 [Thread-5] INFO com.fs.starfarer.combat.CombatEngine - FP1: 71, FP2: 142, maxFP1: 80, maxFP2: 120
4301684 [Thread-5] ERROR com.fs.starfarer.combat.O0OOOOOOOOOO .... OOOOOOOOOOOOOOO - java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space
at com.fs.starfarer.combat.o0OO.super.<init>(Unknown Source)
at com.fs.starfarer.combat.o0OO.B.o00000(Unknown Source)
at com.fs.starfarer.combat.CombatEngine.advance(Unknown Source)
at com.fs.starfarer.title.OoOO.o00000(Unknown Source)
at com.fs.starfarer.B.ØÓÒ000(Unknown Source)
at com.fs.oOOO.A.Ò00000(Unknown Source)
at com.fs.starfarer.combat.O0OOOOOOOOOO .... OOOOOOOO.o00000(Unknown Source)
at com.fs.starfarer.StarfarerLauncher$2.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)