Retail is awesome for its ability to handle alot more bricks before it starts to lag. Theres a good chunk of people that take this to mean they need to use as many bricks as possible. For artistic builds, this isnt a bad thing, but ive seen a few people trying to pass off 10k detailed death match arenas, that are stuffed with particl emitters and lights. my home system can usually handle it fine, but my home system cost me more than my car. (96 Honda civic) My work machine which probably is closer to what most players have is can walk through these environments fine, but when i start trading rocket shots with someone, the FPS can drop quickly.
so just a suggestion to players when your done with that awsome build, take a step back, and ask your self, do i really need to have 2peg wide wall thats as tall as the dresser, and as wide as the bedroom made out of 1x1s?
As a suggestion to modders, make the larger bricks printable, and give them a print that makes it look like they are using staggered 2s and 4s. This would let people use the bigger bricks, and not lose the look that using more of the smaller ones creates.