General

Technic/Tekkit will occupy you for months. I started just macerating ore to get twice the number of ingots out for every ore block, I ended up months later with plans in my head for a giant assembly machine that would create any recipe you put into a central automatic crafting table.

Making Red Power 2 mining machines is fun too, and requires a lot of research into how red power frames and pipes work.

Check your video settings, a lot of the extra stuff they add in like random mobs and fancy rendering takes up a lot of resources. Also, anything with wiring is going to be laggy, so reduce the amount of wiring you have if possible. Sadly, this is especially true of Logistics pipes, so you may want to reign in your plans for them if you're having problems with lag.
Beyond that, I can't really say, my minecraft computer is kinda beastly, so I only notice when I'm playing on my laptop, but then I just turn down the view distance and bear it.

I've just picked up RaiderZ, which looks pretty decent so far. Other than that, I play DC Universe Online, Left 4 Dead 2, TF2, Garry's Mod, Saints Row The Third... A whole bunch of games I can't possibly name off the top of my head this late at night, lol... Also play a lot on PS3, mostly Final Fantasy XIII and XIII-2, Soul Calibur V, Tekken 6, and occasionally on PS Home.

Anyone wants to add me on Steam or PSN, I'm OmegaX123 on the first and OmegaX333 on the second, just let me know you're from here. Always looking for new people to game with.

Right now, I've been playing a really old game called "Outlaw Volleyball." Actually, it "Outlaw Volleyball Remixed" for PS2 but it's still the same game. I can't believe how overlooked the Outlaw sports game series is. I recently tried out "Outlaw Tennis" and that is fun for what it is. Sure, there are stereotypes for each character, but the gameplay is decent.

oh that game reminds me of my childhood, the time i was missing school lessons playing Playstation))

Just started League of Legends if anybody wants to play. Summoner name is sketchmanhull.

I've been playing through Mega Man Legends 2 and Sonic 3. Just got my fourth Sega Genesis so i'm happy. xD It's a later Model 1, so that means I now have 2 model 1s and 2 model 2s.

Legends is such a good game, I was really disappointed when they halted production on the third one :/