In tournaments with faster structures, you have to widen the range of hands you play and ramp up your aggression. The basic reason is that since the blinds rise more rapidly, it costs more chips to sit and fold the same number of hands.
To illustrate this, say it's 5-handed with 5-minute levels and the table speed is 1 minute per hand. If you fold the first 20 hands, you've given up 1 SB plus 1 BB at each of the first four blind levels. Now compare this with 10-minute levels where you gave up 2 SB + 2 BB at each of the first two blind levels. The difference may now seem like much when we talk about SBs and BBs, but because the blinds escalate, it's much larger when we take actual structures and figure out how many chips we're blinding away.