Glide distance vs. weight

Julian Scarfe wrote:

But given that the original poster was most probably talking of airplanes
with noisemakers, I suspect that for him, best glide gets dramatically
worse at higher speeds.

What leads you to that conclusion?

Ok, I don't know the math, so I might be wrong. But my understanding is
that the better L/D at higher weight (hence higher speed) depends on
aerodynamically "clean" aircraft. Airbrakes will change the equation
dramatically. The common light singles (Cessna, Piper and the like) have
lots of airbrakes attached (or, as I said, are just huge airbrakes
themselves). (If you're talking of Cirri or the like, things may be
different.)

Stefan