and another improvement (which could be a core level enhancement)
transfer with a server with high network lantancy (300ms+ ping) is far slower than filezilla.
say i'm in china and the server is located near new york city, and i'll have to suffer a delay of 300ms+ or even more. but both sides have good network, plenty of bandwidth. with filezilla i can reach a speed of 3MB/s+ (or even 8MB/s+) easily, but with flashfxp i can only have a peak of 50KB/s (or even less).
the clue could be the tcpwindowsize, or say, transfer as much data as possible before the next ACK package. ymmv.
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