slowdown in 2.5.15?

[Stan Sanderson]

Mac OS 10.3.8, Lilypond 2.5.15 (thanks to Matthias Neracher)

I have noticed a dramatic increase in the time to process a lilypond 
file compared to 2.5.13. A piano piece of 193 measures takes just short 
of 9 minutes to process (lilypond blitz.ly) on a 1 GHz G4 iMac with no 
other apps running.

This is between 4-7 times slower than 2.5.13 and 2.4.14, running on the 
same machine.

It appears to hang at "calculating line breaks" but eventually begins 
to slowly show the numbers.

Stan