slower download in passive mode

[Sebpouet]

i have try to increade or decrease the tcp ip buffer size, and i have not been able to see a real difference of speed.

Depending of the parameter i used, it was faster (or not) to reach the maximum speed.

i mean, sometime, it needs 3 seconds to reach high speed, and sometimes, around 10 to 15 seconds.

but maximal speed doesn't change significantly.