@coolpapa, i think it's just good that this is a game thats achievements are hard to get. It's annoying when the are like "Play the game for 10 mins and u have all the achievements".
How to crash the physics: This works every time on me. just put 2 portals on exactly same spot and drop a ragdoll on them. Fun! When the physics break just go to the menu at down and press the big red "Panic" button.
@imnottellingyou, PLEASE read the instructions. There are said if you put your mouse on an object and then press shift + any arrow key you can move that object with arrow keys...
I think we should be able to disable blood so that it doesn't appear ever! 0 blood helps a bit but it doesn't fully disable blood. I think this is one of the biggest reasons to lag. (+ if u like)