The new pack + game performance.

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Which option? Threaded optimisation or Vsynch?

For me, ticking off Threaded Optimization cleared up the lag. I hope Rei's gets an update to fix the lag issue some people are having. I can play MC without it anymore lol
 
I'm running the mindcrack version and it actually seems to be running smoother than before.

Yeah same here, I've been flying around today trying to find some (cool/tall) RP2 volcanoes (which took me ~22000 blocks of flying...) and it seemed a lot less laggy than yesterday.
 
I paused the game for 10 minutes and came back and had a bit of lag. Was thinking time to stop and restart, but after a couple seconds the lag stopped and game went back to normal.
 
For me, ticking off Threaded Optimization cleared up the lag. I hope Rei's gets an update to fix the lag issue some people are having. I can play MC without it anymore lol
I know lol. Exploring just isn't the same without waypoints.