Beta 2.20.4 has these error loop and its makes fps slow down, reported.
at com.maddox.il2.engine.Interpolators.destroy(Interpolators.java:263)
at com.maddox.il2.engine.Actor.destroy(Actor.java:770)
at com.maddox.il2.engine.ActorMesh.destroy(ActorMesh.java:49)
at com.maddox.il2.engine.ActorHMesh.destroy(ActorHMesh.java:66)
at com.maddox.il2.objects.ships.BigshipGeneric.destroy(BigshipGeneric.java:2422)
at com.maddox.il2.engine.Engine.destroyListGameActors(Unknown Source)
Fixing it needs 10 days or more.
Tracing this error message in reading source and adding log writing out lines to debug,
finally I find ..... this bug comes from Stock 4.12.2m game BigshipGeneric.class .
Playing stock 4.12.2m without any modding, QMB - Coral sea Online1 - B-25 with 4x 1000lbs bombs and attacking friendly (not necessary but easier than enemy) carrier ..... same error comes in that carrier dying.
But I can fix it soon.
I'll release a new patch 2.20.4b in 2 hours.