How is Darth Vader's ship able to catch the Tantive IV over Tattoine?

Depending on which source you use, such as this one compiled from the video games and appearing in Behind the Magic: (source: theforce.net)

a Corellian Corvette class ship (aka Rebel Blockade Runner class or CR90 corvette), including Princess Leia's Tantive IV, is as fast or faster than an Imperator (or Imperial I) class star destroyer (Vader's ship at the beginning of A New Hope). The Tantive IV should have been able to easily escape by keeping out of range until they were able to jump to hyperspace.

We also see no use of TIE fighters, bombers or interceptors, and that no interdictor ship appears. Given all that, how did Vader's ship get close enough to open fire and disable the princess' ship?