Quote Originally Posted by The Glyphstone View Post
That's sort of what I was asking - my best in T1 is clearing a level 12 rift, then timing out on 13, while in T2 i could clear a level 11 rift and timed out on 12.
Actually, as Chen said, GRs don't care what difficulty you're on. A level 12 GR is the same difficulty whether you open it on T1 or T6. Any discrepancy you experience is likely explained by the GR itself - the types of enemies you were up against, any fixtures that help you harm monsters (the Act V Nephalem Ruins map is rife with these), any shrines that pop up, space between packs etc.