1. Millenaire is very laggy, but worth it. Try all the things you'd do to raise FPS. Just be prepared for it to lag.
2. That would be Post Finem. Might wanna read the post I made on HQM strategy, because Post Finem has enviromine in it, which is PAINFUL if you don't know what you're doing. No literally, the graphical effects may need to be turned down if you, like me, are prone to graphical effects causing headaches.
You might also wanna brush up on your organic chemistry if thats the case as well, and on radioactivity. Hint, NEVER EVER EVER put ender pearls in a chemical decomposer. Bad idea, very bad. Same with nether stars.
Phoenix I also wanted to add, agricraft adds a small issue with the scholarly bee branch, they need wheat and so do the rural bees. Any... way you could make it that the bees know when wheat is being grown nearby on agricraft crops? Pollination, and accellerating crop growth, is one of the major upsides to struggling with beekeeping and breeding.
That said, yay for thaumcraft and timely branch bees! Doctor Who inspired bee products here I come!