Ok, Expedite Climb, maybe I should've used words to the effect of: "isn't quite as efficient as slow airspeeds."
That might be a little more to the point, eh?
The 757 is notorious. Nike, if you're interested, there's a link below to an accident report involving a Westwind and 757 wake.
If I'm not mistaken this was the crash that really opened people's eyes to the special hazards of 757 wake (at least in America).
The sequence of events leading up to the wake turbulence encounter demonstrates the high performance decents the 757 is capable of.
Specifically, the 757 slows to less than 150kts on a 5.6 glidepath. Meanwhile the Westwind pilot continues just "one dot high" on the Glideslope.
In this case it just wasn't good enough.
Fly safe!
IAI Westwind vs. Boeing 757 wake