Thanks for your advice.
I'll try to test with FTPs with port other than 21.
I had a chance to upload files to my friend's FTP yesterday. The FTP server was Serv-U 4.0 with port 21. I used CuteFTP at first and I got 49.5 KB/s upload. I logged off and used FlashFXP. The upload speed dropped to 21.5 KB/s with FlashFXP. I switched back to CuteFTP. It gave me 49.5 KB/s upload again. So I had to use it until I finished uploading. How come is there so much upload speed difference between two? It's not ISP blocking some port problem.
Sorry about mentioning other products here, but I have no choice to explain the problem that others hardly believe. Also I want FlashFXP to remain as the best, otherwise I wouldn't post comparisons here.
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