[cups.general] Leak in 1.3.7?

[ALi]

Hello,
we are using cups 1.3.7 (i think it is the default that comes with
redhat installation), and we are seeing that there is a delay or leak
in the time that takes the lp command to execute.
For example we have a time measure in java that measures that the
system("lp -d queue file") command and it has started to grow ....
from 500 ms to 700 ms more or less, the last time when the measure has
grown until 900 the cups failed, so we wont want to wait until that if
we can avoid it.
We have seen, that when the cups has restarted, the time is improved.
So we suspect some kind of leak in the cups, can it be possible?

the system prints 45000 files per day and the delay start to be
feeling with a month working ..... from the 350-500 of the start of
the month, till the 700-800 of the end of the month


the cupsd.conf is here http://pastebin.org/HFNmXQ6E (we suspect of
something in the cache :S)

thx for all