proportional notation

[Orm Finnendahl]

Hi,

trying to convince lilypond to keep the proportional notation correct
is very time-consuming (ca. 1/2 hour for one line; sigh!). It is
especially hard to figure out, why the second value of the
ly:make-moment form sometimes has to get doubled in order to make a
bar stretch out 10% more than with half the value.

Can someone shed a light on how the algorithm works, so that I can get
better estimates and don't have to recompile that often?

--
Orm