Start it up, leave it for maybe 10-15 minutes (maybe a little longer based on the low RAM) - there may be a console message saying "profiling complete"? Someone who knows Myst better than me may be able to confirm that?
But when you see something like that, then give it a go?
Sure, I will give it a go and see what happens. Looking at the change log for 1.5.0, it does say that Mystcraft was updated. At the moment, we don't have any Mystcraft world started yet. Has Mystcraft always done the 'profiling' or is that new with the update?
The biggest change I see is that a new mod was added and one disabled:
- Added Portal Gun 4.0.0-beta-4
- Disabled MobiusCore by default
Is it possible they would they be the issue? I don't see anyone else complaining about 1.5 having any lag issues which is why I'm trying to figure this out.