They glide better because they have much less drag. They're slick and
don't have
landing gear and other cruft sticking out (and what antennas and stuff
they do have
are much smaller in ratio to the overall area).

I had heard that airliners will generally glide a 3 degree glideslope, clean
and power off. Something that GA airplanes have no hope of doing.

It is a FAST ILS though - less than a minute at 250K.

- Mark