Status output freezed on windows

[k79e]

Run program for some time.
The rate becomes 0 but program is still send out packets.

percent or progress is freezed too.

I'm using ssh module

Today I found the speed is also slow down when running for long time
Stats: 0:47:29
Rate: 119.21;
Stats: 0:47:31
Rate: 98.58; F
Stats: 0:47:32
Rate: 91.25; F
Stats: 0:47:33
Rate: 79.30; F
Stats: 0:47:36
Rate: 73.29; F
Stats: 0:48:09
Rate: 10.00; F
Stats: 0:48:14
Rate: 9.86; Fo
Stats: 0:57:32
Rate: 11.70; F
Stats: 0:57:34
Rate: 14.92; F
Stats: 0:57:35
Rate: 14.05; F
Stats: 0:58:23
Rate: 41.00; F

The cpu usage didn't drop down when this speed drop down.

I'm using parameter like #102 (comment)
Today I found that -m is more stable? (Not very sure)

after 45min speed suddenly drop down
Rate: 274.47;
Stats: 0:46:14
Rate: 46.65; F
Stats: 0:46:18
Rate: 37.55; F
Stats: 0:46:27
Rate: 33.70; F
Stats: 0:46:34
Rate: 27.89; F
Progress is @ 99.75% but it's around 35 hosts left. (calculated by number of services completed but the "about xxx done" is drop back!! it's from 18% to 14%)

at 50min the rate become 0 but there still around 30 hosts left!!!!
Cpu usage is 25% which is a full core and it's still sending packets(It looks like the real speed is not drop down with -m but with -g they all drop down)

[k79e]

Here is some info under linux when the rate become veryslow (1-2)
#0 0x00007f5113ec97b7 in epoll_wait (epfd=7, events=0x5631dcc40d50,
maxevents=8222, timeout=168) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
#1 0x00005631cc15ca4a in ?? ()
#2 0x00005631cc158152 in ?? ()
#3 0x00005631cc130058 in ?? ()
#4 0x00005631cc12b01f in ?? ()
#5 0x00007f5113df409b in __libc_start_main (main=0x5631cc12afe0, argc=18,
argv=0x7ffe945c1588, init=, fini=,
rtld_fini=, stack_end=0x7ffe945c1578)
at ../csu/libc-start.c:308
#6 0x00005631cc12b2aa in ?? ()