INN slows down

[Pavel V. Knyazev]

Hello.

I'm running a binary site under INN 2.3.2.
When i try to download headers, the server slows down.
I see a lot of processes:
64445 60569 news  ??  RN     2:04.09 nnrpd: r-3512-65-9.surnet.ru next
(nnrpd)
64461 60569 news  ??  RN     1:36.68 nnrpd: r-3512-65-9.surnet.ru next
(nnrpd)
64467 60569 news  ??  RN     1:28.46 nnrpd: r-3512-65-9.surnet.ru next
(nnrpd)
64514 60569 news  ??  RN     1:09.64 nnrpd: r-3512-65-9.surnet.ru next
(nnrpd)
64541 60569 news  ??  RN     0:47.20 nnrpd: r-3512-65-9.surnet.ru next
(nnrpd)
64578 60569 news  ??  RN     0:31.21 nnrpd: r-3512-65-9.surnet.ru next
(nnrpd)
64598 60569 news  ??  RN     0:15.78 nnrpd: r-3512-65-9.surnet.ru next
(nnrpd)

CPU states:  2.7% user,  2.3% nice, 94.2% system,  0.8% interrupt,  0.0%
idle

Why does this happen?

--
Pavel