Thank you for the information.
The speed I talked is not related to download/upload speed ,but the system performace.
my situation is that when I run 5 instances of flashfxp(build 1548 and previous one), they will take over my 80% - 90% of CPU time, so if I start another application, this application will become very slow to appear and whole system become slower.
Now I run the version 3.6, the same 5 instances of flashfxp, I see my system still has over 90% CPU for free. so I am very happy with v3.6.
In both cases, I still has 50% memory. so memory is not the issue.
the other thing I found after switch back to v3.6 is that v3.6 has good quality of download, which means I found some download files are not the same size like ftp server by using v4.0. But v3.6 , seems like, don't has this problem. all download files has the same size as ftp server. Maybe I am wrong. but I feel like this.
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