1.3.0: Lag shortly after creating new world.

[BrickVoid]

Version:
1.3.0

What is the bug:
Twice now, I've encountered lag shortly after the creation of a new world, on the first day, it seems to be very serious lag, because it stops the sun from moving across the sky. I don't know what the cause is, because what I'm doing is digging around getting the initial materials I'll need to survive in a world.

Exiting and restarting Minecraft might stop the cause of the world lagging like hell, but if it keeps happening every time a new world is started, it needs to be looked into. I say 'might' because I've only done this twice on this version, both times it successfully stopped the world lag.

I haven't had any crash reports but I wonder if anyone else is experiencing the same problems?

Cheers ...

BrickVoid

Mod & Version:


Paste.feed-the-beast.com log:


Can it be repeated:


Known Fix:

 

[Dannyaaaa]

That is Mystcraft world profiling( or something like that, it show a notification about it in the corner where achievements show up.). It should take between 5-30 minutes, and after that the lag should stop. It allows custom ore generation without instability in mystcraft ages.