"svn log" is too slow

Hello!
    I am running subversion(1.1.4) with the DAV module under apache2 and
my subversion server is P4 2.4G/512M sdram. The normal operations like
check in/out etc are fine, but I found that
"svn log http://xx.xx.xx.xx/repos" is very slow гнгнгн it almost took me
15 seconds ( the subversion repos has 5000 files ).
        
    I have searched this mailling-list and set "SVNPathAuthz Off" in the
   <Location> of dav_svn.conf , but the "svn log" is still slow . How
can I solve this problem ?

thanks and regards,
Falls Huang

PS. if possible please CC me as I am not on the list(but do check it
from time to time).

-- 
Regards
Falls Huang
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