Time Problem Avrdude 5.3.1 on mac

Hello,
I have a little problem on programming with avrdude 5.3.1 and usb avrisp on mac.
I can program without problem but avrdude takes a time at start and I don't 
know where does it come from.
I use ktrace to get the system call and see what happens.
I see a 12 seconds time that must not happen because when I use it on linux, it 
does not happen.
It does not happen with a serial avrisp too on mac.
 
 25137 avrdude  0.000066 RET   pread 4096/0x1000
 25137 avrdude  0.000076 CALL  mmap(0xcc000,0xf000,0x5,0x12,0x4,0)
 25137 avrdude  0.000093 RET   mmap 835584/0xcc000
 25137 avrdude  0.000016 CALL  mmap(0xdb000,0x1000,0x3,0x12,0x4,0xf000)
 25137 avrdude  0.000036 RET   mmap 897024/0xdb000
 25137 avrdude  0.000009 CALL  mmap(0xdc000,0x900c,0x1,0x12,0x4,0x10000)
 25137 avrdude  0.000029 RET   mmap 901120/0xdc000
 25137 avrdude  0.000041 CALL  close(0x4)
 25137 avrdude  0.000015 RET   close 0
 25137 avrdude  0.327948 CALL  write(0x2,0xbfffe6e0,0x3f)
 25137 avrdude  0.000084 GIO   fd 2 wrote 63 bytes
       "avrdude: usbdev_open(): Found AVRISP mkII, serno: 0000B0009933
       "
 25137 avrdude  0.000016 RET   write 63/0x3f
 25137 avrdude  12.109464 CALL  write(0x2,0xbfffe8f0,0x257)                     
               // 12 seconds ???
 25137 avrdude  0.000088 GIO   fd 2 wrote 599 bytes
       "         AVR Part              : ATMEGA64
          Chip Erase delay      : 9000 us
          PAGEL                 : PD7
          BS2                   : PA0
          RESET disposition     : dedicated
          RETRY pulse           : SCK
          serial program mode   : yes
          parallel program mode : yes
          Timeout               : 200
          StabDelay             : 100
          CmdexeDelay           : 25
          SyncLoops             : 32
          ByteDelay             : 0
          PollIndex             : 3
          PollValue             : 0x53
          Memory Detail         :
 
Thanks a lot.
 
Yannick Podgorski 
France