Reduce download speed at last

[mrb0098]

hi
thanks for your useful module
i use this lib to download files with multi threading ( 5 thread)
but problem is :
download start with fast speed (10 ~ 20 MB/sec)
but at last (after 80%) download speed reduce under 1 MB/sec
any way to fix this ?

[0x44454c]

Looks like same case here also!